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Using Percents Part 2. Rate of interest is the percent charged or earned. Simple Interest. Time that the money is borrowed or invested (in years). Principal is the amount of money borrowed or invested. What is interest?.

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Using percents part 2

Using PercentsPart 2


What is interest

Rate of interestis the percent charged or earned

Simple Interest

Time that the money is borrowed or invested (in years)

Principal is the amount of money borrowed or invested

What is interest?

When you borrow money from a bank, you pay interest for the use of the bank’s money. When you deposit money into a savings account, you are paid interest. Simple interest is one type of fee paid for the use of money.

I= Prt


Calculate simple interest
Calculate Simple Interest

To buy a car, Jessica borrowed $15,000 for 3 years at an annual simple interest rate of 9%. How much interest will she pay if she pays the entire loan off at the end of the third year? What is the total amount that she will repay?

First, find the interest she will pay.

I = PrtUse the formula.

I = 15,000  0.09 3 Substitute. Use 0.09 for 9%.

  • I = 4050Solve for I.


Calculate simple interest1
Calculate Simple Interest…

Jessica will pay $4050 in interest.

You can find the total amount A to be repaid on a loan by adding the principal P to the interest I.

P+ I = Aprincipal + interest = amount

15,000 + 4050 = ASubstitute.

Jessica will repay a total of $19,050 on her loan.


Calculate simple interest2
Calculate Simple Interest

  • Nancy’s grandmother opened a savings account for her and put in $1,250. The account pays 3% simple interest.

  • How much interest will the account earn in 5 years?

  • How much will be in the account after 5 years?

First, find the interest she will earn.

I = PrtUse the formula.

I = 1,250 0.03 5Substitute. Use 0.09 for 9%.

  • I = $187.50Solve for I.


Calculate simple interest3
Calculate Simple Interest

Nancy will earn $187.50 in interest.

You can find the total amount Ain her account by adding the principal P to the interest I.

P+ I = Aprincipal + interest = amount

1,250 + 187.50= ASubstitute.

Nancy will have a total of $1,437.50 in her savings account.


Practice
Practice

  • A bank is offering 2.5% simple interest on a savings account. If you deposit $5000, how much interest will you earn in one year?

$125


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