Find the future value for each of the following scenarios, where m is the periodic deposit and r is the interest rate.
a. m = $500, r = 0.03 for 5 years
b. m = $200, r = 0.04 for 3 years
c. m = $1000, r = 0.02 for 7 years
d. m = $300, r = 0.05 for 4 years