Question 1201582
If I am reading this correctly, you want to determine the price at which you can charge for the shoes so that the retail prices of $799.95 is a 55% markup.  Therefore, you want to know 155% of what value is $799.95.  Use 155% to be 100% of the original price and the 55% markup.  

155% * c = 799.95
Divide both sides by 155% for a result of $516.10.