if you supply the interest rate.
We could answer your question if you supply the interest rate.
its not that hard to understand - break it down and think clearly about what each part is saying.
You wish to deposit $500 per month into an account for 36 months. Assume your interest rate is equal to the prime interest rate.
a) How much do you have (total) in the account after 36 months?
b) How much of that total is interest?