Jerry buys a $2,700 motorcycle on a deferred payment plan. There is no down payment and no interest for 18 months. Jerry must make a minimum payment of $75 a month. To avoid a retroactive APR of 21%, he must pay the balance in full before the 18 months has passed. If he pays $75 each month, how much should he pay the last month to avoid the interest charges?

A. $1,425  B. $1,350  C. $1,500  D. $2,075