Suppose you're buying a car for $40,000 and requires a loan to pay for it. Find the monthly payments, the total amount paid and total interest paid under each of the three options given below.

A. Monthly payments for 3 years starting one month after the purchase, with an annual rate of 2.5% compounded monthly. --> (so monthly rate is 0.025/12)

B. Monthly payments for 3 years starting 6 months after the purchase, with an annual interest rate of 3.5% compounded monthly.

C. Monthly payments for 3 years starting one month after the purchase with nominal interest compounded monthly of 2% for the first year, 3% for the second year and 4% for the third year. Payments for the first year are X, the second year are X + 25 and the third year X+50.

( For comparison, for A I found monthly payments =1154.46, and for B monthly payments 1189.28, not sure if these are correct)