Mark Would Like to Purchase a Stock Priced at $70

Mark would like to purchase a stock priced at $70. Mark thinks he can sell the stock for $100 after one year. If Mark does not borrow any money from his brokerage firm, what is the estimated return on the stock?

A) 30.00 percent
B) -42.86 percent
C) -30.00 percent
D) 42.86 percent
E) none of the above