Compound Interest (Leaving Cert Mathematics): Quizzes

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Compound Interest
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What is compound interest?

Interest on principal & accumulated interest

What does 'principal' mean in compound interest?

The original amount invested

How does compound interest differ from simple interest?

It's calculated on the growing total

What is the compound interest formula?

F=P(1+i)nF = P(1 + i)^n

What is (1+i)(1 + i) called in the compound interest formula?

The multiplier

What decimal should you use to multiply for 7.5% interest?

1.075

What is the interest on €2800 for 3 years at 7.5% p.a.?

€678.43

What formula finds the rate when principal and interest are known?

Rate =(Interest÷Principal)×100%= (\text{Interest} \div \text{Principal}) \times 100\%

What is depreciation?

Losing value over time

What characterises the multiplier for depreciation?

Always less than 1

What does AER stand for?

Annual Equivalent Rate

A machine is worth €58,320 after 3 years of 10% annual depreciation. What was its original value?

€80,000

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