Bryson's Pharmacy has purchased a small auto for delivery of prescriptions. The auto cost $$28,000$ and will be usable for seven years. Delivery of prescriptions $($which the pharmacy has never done before$)$ should increase revenues by at least $$25,000$ per year. The cost of these prescriptions will be about $$18,000$ per year. The pharmacy depreciates all assets by the straight$-$line method.

Compute the accounting rate of return for the new auto. $($Round your answer to the nearest percent$)$

Group of answer choices

$7\%$

$13\%$

$11\%$

$9\%$