An Investor Purchased on Margin Orange Computer for $30 a Share

An investor purchased on margin Orange Computer for $30 a share. The stock's price subsequently increased to $50 a share at which time the investor sold the stock. If the margin requirement were 60 percent and the interest rate on borrowed funds were 7 percent, what would be the percentage earned on the investor's funds (excluding commissions) What would have been the return if the investor had not bought the stock on margin