SIMPLE INTEREST Interest is the amount paid for the use of money.
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Transcript of SIMPLE INTEREST Interest is the amount paid for the use of money.
SIMPLE INTEREST
Interest is the amount
paid for the use of money.
FORMULA
I=PRT
INTEREST EQUALS• PRINCIPAL - the amount of money
invested or borrowed.• RATE - is in the annual interest converted
to a decimal.• TIME - in years.• BALANCE – the sum of the
principal and interest earned.
SAVINGS ACCOUNT
•You can also use the formula to find the simple interest when you deposit money in a savings account.
INVESTING• Angie has $500 in a savings
account that pays 5% simple interest.
• How much interest will she earn in 2 years?
• Note: 5% equals 0.05 as a decimal.
I=PRT 205.0500I
50I50$Interest
Balance = 500 + 50 = $550
• How much interest will she earn if she withdraws the money after 9 months?
• 9 months equals 9/12 of a year or 0.75 as a decimal.
75.005.0500I75.18$I
Your turn.
• How much interest would you earn on $1000, at 6¾% a year for 4¼ years?
25.40675.01000 88.286$
Balance = 1000 + 286.88 = $1286.88
When invested at an annual interest rate of 6% an account earned $180.00 of simple interest in one year. How much money was originally
invested in account?
• I = PRT• 180=• 180 = .06P
.06 .06
3,000 = P
• Interest paid by bank • Principle (invested) is unknown• Rate changed to decimal• Time is 1 year• Multiply• Divide
P (.06) (1)
A savings account is set up so that the simple interest earned on the investment is moved into a separate account at the end of each year. If an investment of $2,000
accumulate $360 of interest in the account after 4 years, what was the annual simple interest rate on the savings account?
• I = PRT• 360=• 360 = (2,000)(4)R• 360 = 8,000 R
8,000 8,000
0.045 = R
4.5% = R
• Interest paid by bank• Principle (invested)• Rate is unknown• Time is 4 years• Regroup & Multiply• Divide• Change to %
(2,000) (R) (4)