i don't understand what formula to use.

You invest in Ivanhoe Corp. stock at a price of $64.75 per share. At the end of one year, you sell your shares for $72.75 per share and you received a $1.85 per share dividend during the year. What is your return on investment for this period? 0 15.21% 9.50% O 11.92% C) 13.87%