The cost of a pair of genuine snake skin boots cost a store…

The cost of a pair of genuine snake skin boots cost a store owner $800, and she sold the pair of boots for $840.  Step 1: What was her profit? $   Step 2: What was her percent of profit based on cost? Round the percentage to the nearest hundredth, if necessary.     %   Step 3: What was her percent of profit based on selling price? Round your answer to the nearest hundredth, if necessary.   %