A 21-year mortgage is amortized by making payments of $3052.61 at the end of every three months. If interest is 8.45% compounded annually, and you want to know what was the original mortgage balance? Find p (the equivalent rate of Interest per payment period) Select one: O a. 0.015075125 b. 0.0055556 O C. 0.024329 d. 0.0204868 e. 0.0078846