Your mother helped you start saving $10 a month beginning on your 5^thbirthday, which is on May 1^st. She always made you make your deposit on the first day of each month just to "start the month out right". Today, you turn 21 and have $6,984 in your account. What is the rate of return on your savings?

A) 13.62% B) 13.68% C) 13.75% D) 13.81% E) 13.86%

The answer is C. But i dont know how to get the answer. Can you show me via financial calculator or excel. I will give thumbs up. Thanks