Compound Interest (Junior Cert Mathematics): Flashcards

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Compound Interest
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Compound interest definition

Interest added to new total; earns interest on previous interest

Principal definition

Starting amount of money invested or borrowed

Interest definition

Extra money added/owed based on principal

Rate definition (compound interest)

Percentage at which interest is added (usually per year)

Final value/amount definition

Total money after all interest added at end of period

Compound interest formula

F=P(1+i)tF = P(1 + i)^t

FF in compound interest formula

Final amount (total at end)

PP in compound interest formula

Principal (starting amount)

ii in compound interest formula

Interest rate as a decimal

tt in compound interest formula

Time in years

Converting 5% to decimal

Divide by 100: 5% = 0.05

Why add 1 to rate in compound interest formula

Calculates principal + interest together

Why raise to power of tt in compound interest

Calculates compound growth over multiple years

Location of compound interest formula

Formulae and Tables book

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