You purchase $180$ shares for $$50$ a share $($$$9,000),$ and after a year the price rises to $$60.$ Calculate the percentage return on your investment if you bought the stock on margin and the margin requirement was $($ignore commissions, dividends, and interest expense$)$:

a$.25$ percent. Round your answer to one decimal place.

b$.60$ percent. Round your answer to one decimal place.