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
![I=\text{PRT}](https://img.qammunity.org/2023/formulas/mathematics/college/8al5hlyqqe7wy2xbqt6s9o5c8cg4pk6wox.png)
In our case, we have:
P =$2500
R = 13.25% = 0.1325
T = 18 months = 1 year, 6 months = 1.5 years
![I=2500*13.25\text{ \%}*(18)/(12)=2500*0.1325*1.5=496.875](https://img.qammunity.org/2023/formulas/mathematics/college/c1racdtadqvdcu7h8ei3o1hj8kdo76r957.png)
Simple Interest = $496.875
Total amount after 18 months = $2,996.875