The Cost of a Case of Computer Paper Sold to a Retailer

The cost of a case of computer paper sold to a retailer is $20. It costs $2 to ship the paper. If more than two boxes are purchased, the price per case is reduced by 5 percent. If the reseller engages in co-op advertising with the producer of the paper, there is an additional one percent discount. What is the base price of a case of computer paper?

A) $18.80
B) $19.00
C) $20.00
D) $20.68
E) $22.00