Consider the following data for Stock $xYZ$ and then choose the correct answer to the question

below:

Current Price of Stock XYZ $$35\mathrm{.}00$

Exercise Price of $3-$month Put $,$$$40\mathrm{.}00$

Market Price of Put $$8\mathrm{.}00$

If at expiration of the put option the price of the stock is at $$30\mathrm{.}00,$ what would be the $\%$ return

earned or lost by a buyer of the put option?