Daniel saved for his child's college education by saving $260 per month for 17 years. He was able to earn 12.7% interest compounded monthly and accumulated a total of $185842.74 at the end of the 17 years. How much interest did he earn?
a. $132802.74
b. $56134
c. $1992.24
d. $4420
e. $21698.55