How long will it take an RESP to grow to $200,000, if the plan owner contributes $250

Question:

How long will it take an RESP to grow to $200,000, if the plan owner contributes $250 at the end of each month and the plan earns:
a. 8% compounded monthly?
b. 8% compounded quarterly?
c. 8% compounded semiannually?
d. 8% compounded annually?
Round up the number of contributions to the next integer before calculating the total time.