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Simple interestCredit agreements

Investigating the impact of interest rates on savings and borrowing. Simple interest is calculated annually using the interest rate. Simple interest is always calculated using the original amount.

Part of Application of MathsFinancial skills

Credit agreements

Finding a deposit

A credit agreement is a popular way of buying expensive goods. Using a credit agreement you usually pay a deposit first and the remainder by monthly instalments. Goods normally cost more on a credit agreement.

Example

Three people watching television with ecstatic expressions.

Tom wants to buy a TV through a credit agreement. He has been asked to make a deposit of one fifth of the total price of \(\pounds200\).

How much will the deposit be?

Deposit \(= \frac{1}{5}\) of \(\pounds200\)

\(= \frac{200}{5}\)

\(= \pounds40\)

Tom needs to make a deposit of \(\pounds40\).

Now find the deposit for each of the following:

Question

How much will a deposit of \(15\%\) of \(拢300\) be?

Question

How much will a deposit of \(\frac{1}{4}\) of \(\pounds300\) be?

Question

How much will a deposit of \(20%\) of \(拢500\) be?

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