You purchase $170$ shares for $$50$ a share $($$$8,500),$ and after a year the price falls to $$45.$ 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$)$:

$15$ percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place.

$\%$

$30$ percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place.

$\%$

$75$ percent. Use a minus sign to enter the amount as a negative value. Round your answer to one decimal place.

$\%$