Posted by Tanisha on .
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 
Reiny,
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 
Tanisha,
so the answer or the first one is 135 and im not supposed to add 900 to 135?

Math Pre Algebra 
Reiny,
it just asked for the interest
If you add the 135 to the original 900 you would have the "amount" 
Math Pre Algebra 
Tanisha,
oh ok thank you

Math Pre Algebra 
Tanisha,
for the second one do i do
1348(0.0025)(1.5)= 5 
Math Pre Algebra 
Reiny,
small slipup
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)