Barry has bought a new car and needs a loan of 12,000 to pay for it. The car dealer offers Barry two loan alternatives:

a) Monthly payments for 3 years, beginning one month after purchase with an annual interest rate of 12% compounded monthly, or

b) Monthly payments for 4 years, also starting one month after the purchase, with an annual interest rate of 15%, compounded monthly.

Find Barry's monthly payment and the total amount paid over the course of the payment period in each of the two options.