The answer is B, 12.5%. I just need to know how to get the answer.

Nico bought 500 shares of a stock for $24.00 per share on January 1, 2013. He received a dividend of $2.50 per share at the end of 2013 and $4.00 per share at the end of 2014. At the end of 2015, Nico collected a dividend of $3.00 per share and sold his stock for $20.00 per share. What is Nico's realized total rate of return?

A) -12.5%

B) 12.5%

C) -20.7%

D) 20.7%