Key Calculations (Junior Cert Business Studies): Revision Notes
Key Calculations
Cash flow calculations
Understanding how money flows in and out of a business is essential for financial management. These calculations help you track and predict cash movements.
Net cash represents the difference between what money comes in and what goes out during a specific period. To find this, you subtract total expenditure from total income. This shows whether a business made or lost money overall.
Closing cash tells you how much cash a business has at the end of a period. You calculate this by adding any net cash (profit or loss) to the opening cash balance from the start of the period.
When calculating total expenditure, you need to include three types of spending:
- Fixed expenditure - regular costs like rent
- Irregular expenditure - occasional costs like repairs
- Discretionary expenditure - optional spending like advertising
Worked Example: Calculating Net Cash
Step 1: Identify total income Total Income = $50,000
Step 2: Calculate total expenditure Fixed expenditure: 8,000 Discretionary expenditure: 28,000
Step 3: Calculate net cash Net Cash = Total Income - Total Expenditure Net Cash = 28,000 = $22,000
Interest calculations
Interest calculations are crucial for understanding the cost of borrowing money or the return on savings and investments.
Simple interest is the most straightforward type of interest calculation. You multiply the original amount by the interest rate, then divide by 100. This type of interest doesn't compound, meaning you only earn interest on the original amount.
Compound interest is more complex because it builds on itself. You calculate it using the balance at the start of each year, multiplied by the interest rate, divided by 100. This means you earn interest on both your original investment and any previously earned interest.
Key Interest Formulas:
Simple interest =
Compound interest =
Insurance calculations
Insurance calculations help determine premiums and claims payments, ensuring fair coverage for policyholders.
Total premium represents the final amount a customer pays for insurance coverage. You start with the basic premium, add any loadings (extra charges for higher risk), then subtract any discounts offered.
The average clause is particularly important for underinsurance situations. It calculates how much an insurance company will pay when a property isn't insured for its full value. You divide the amount insured by the actual value, then multiply by the loss amount.
Beware of Underinsurance!
The average clause can significantly reduce claim payments if a property isn't insured for its full value. Always ensure adequate insurance coverage to avoid unexpected financial losses.
Pay and taxation calculations
These calculations are essential for determining how much employees earn and what they owe in taxes.
Basic pay forms the foundation of most wage calculations. For hourly workers, you multiply the basic hourly rate by the number of normal hours worked. For piece-rate workers, you multiply the rate per item by the number of items they produced.
Overtime pay compensates workers for extra hours beyond their normal schedule. You calculate this by multiplying the number of overtime hours by the overtime rate (usually higher than the basic rate).
Commission rewards sales staff based on their performance. You divide total sales by 100, then multiply by the commission rate percentage.
Pay Calculation Sequence:
- Calculate basic pay first
- Add overtime pay (if applicable)
- Add commission (if applicable)
- Add any bonuses = Gross Pay
- Subtract all deductions = Net Pay
Gross pay represents total earnings before deductions. You add basic pay to any overtime, commission, or bonus payments.
Net pay is what employees actually take home. You subtract all deductions (tax, PRSI, pension contributions) from gross pay.
Tax payable is the actual tax owed after considering tax credits. You subtract any tax credits from the total income tax calculated.
Profit and loss calculations
Profit calculations are fundamental to understanding business performance and making informed decisions.
Gross profit shows how much money remains after paying for goods sold. You subtract the cost of sales from total sales revenue. This indicates how efficiently a business manages its direct costs.
Cost of sales includes all direct costs of producing goods. You add opening stock, purchases, carriage inwards, and import duties, then subtract closing stock.
Don't Confuse Markup and Margin!
Remember: Markup uses cost price as the base, while margin uses selling price.
Markup and margin are two ways to express profit relationships. Markup shows profit as a percentage of cost price, while margin shows profit as a percentage of selling price.
Net profit represents the final profit after all expenses. You add any gains to gross profit, then subtract all operating expenses.
Worked Example: Calculating Gross Profit and Markup
Step 1: Identify the values Cost price = 120
Step 2: Calculate gross profit
Gross profit = Selling price - Cost price
Gross profit = 80 = $40
Step 3: Calculate markup Markup = (Gross profit ÷ Cost price) × 100 Markup = (80) × 100 = 50%
Depreciation calculations
Depreciation spreads the cost of fixed assets over their useful life, providing a more accurate picture of business performance.
Straight line depreciation is the simpler method. You multiply the cost price of the fixed asset by the depreciation rate, then divide by 100. This gives the same depreciation amount each year.
Reducing balance depreciation applies the depreciation rate to the net book value at the start of each year. This method produces higher depreciation in early years and lower amounts later.
Choosing Depreciation Methods:
- Straight line is simpler and provides consistent annual amounts
- Reducing balance is more realistic for assets that lose value quickly in early years (like vehicles and technology)
Business performance ratios
These ratios help analyse business efficiency and financial health, making it easier to compare performance over time or against competitors.
Working capital measures a business's short-term financial health. You subtract current liabilities from current assets. Positive working capital indicates the business can meet its short-term obligations.
Stock turnover shows how efficiently a business manages inventory. You divide cost of sales by average stock held. Higher turnover generally indicates better inventory management.
Average stock provides the basis for turnover calculations. You add opening stock to closing stock, then divide by two.
Various profit percentages help compare performance:
- Net profit percentage shows net profit as a percentage of sales
- Gross profit percentage shows gross profit as a percentage of sales
- Return on capital employed shows net profit as a percentage of capital employed
Financial ratios
These ratios assess a business's ability to pay its debts and manage financial risk.
Working capital ratio compares current assets to current liabilities. A ratio above 1:1 suggests the business can meet short-term obligations.
Acid test ratio provides a stricter liquidity measure by excluding stock from current assets. This shows whether a business can pay debts using only liquid assets.
Solvency measures long-term financial stability by comparing total assets to external liabilities.
Gearing shows the balance between debt and equity financing. Higher gearing indicates greater financial risk but potentially higher returns.
Why Exclude Stock from Acid Test Ratio?
Stock is excluded because it's not always easy to convert to cash quickly. The acid test ratio focuses on the most liquid assets to give a stricter measure of a business's ability to pay immediate debts.
Economic indicators
These calculations help measure national economic performance and inform policy decisions.
Rate of inflation measures how much prices have increased over time. You subtract the previous year's cost of living from the current year's cost, then multiply by 100.
Economic growth rate tracks the expansion of national output. You subtract the previous year's output value from the current year's output value, then multiply by 100.
National debt represents the total amount a government owes, combining both domestic and foreign debt.
Key Points to Remember:
- Net cash equals total income minus total expenditure - this shows whether money is coming in or going out overall
- Compound interest builds on itself each year, while simple interest only applies to the original amount
- Markupuses cost price as the base, whilemarginuses selling price - don't mix these up
- Working capital (current assets minus current liabilities) indicates short-term financial health
- The acid test ratio excludes stock because it's not always easy to convert to cash quickly