# Math Pre Algebra

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Find the simple interest.

\$900 deposited at an interest rate of 3% for 5 years.

\$1,348 deposited at an interest rate of 2.5% for 18 months.

• Math Pre Algebra -

simple interest = principal x rate x time
for the first one:
interest = 900(.03)(5) = 135

do the second one the same way, use 18/12 for the time.

• Math Pre Algebra -

so the answer or the first one is 135 and im not supposed to add 900 to 135?

• Math Pre Algebra -

it just asked for the interest

If you add the 135 to the original 900 you would have the "amount"

• Math Pre Algebra -

oh ok thank you

• Math Pre Algebra -

for the second one do i do

1348(0.0025)(1.5)= 5

• Math Pre Algebra -

small slip-up
2.5% = .025 not .0025 like you have

interest = 1348(.025)(1.5) = 50.55

(love to have a loan of %1348 where I would only pay \$5 in 1 1/2 years)

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