Andre put $2500 into an 18 month money market account. The interest rate is 13.25% simple interest. How much money will Andre have in the account at the end of the 18 months?

Simple interest gives us how much return our money gets after a period. There are certain data we need to properly calculate it.
The money invested is the Principal, P
The rate of return is R
The period for which it is invested is T
SIMPLE INTEREST FORMULA
[tex]I=\text{PRT}[/tex]In our case, we have:
P =$2500
R = 13.25% = 0.1325
T = 18 months = 1 year, 6 months = 1.5 years
[tex]I=2500\times13.25\text{ \%}\times\frac{18}{12}=2500\times0.1325\times1.5=496.875[/tex]Simple Interest = $496.875
Total amount after 18 months = $2,996.875