Let's say Erin is considering opening an account with Fidelity Investments, in a bond-mutual-fund. The fund has an expected rate of return of 7.72% and Erin plans to make monthly deposits in this account for the next thirty years. Based on this information, what is the interest factor?
a. 1,408.31
b. 1,325.37
c. 1,154.66
d. 1,125.55