A retailer buys a particular product for $4. To make a profit, the retailer adds $2 to cover operating expenses and provide a profit. The percentage markup on the $6 selling price is
A. 50 percent
B. 33.33 percent
C. 100 percent
D. 20 percent
E. 25 percent

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?