A merchant bought some goods at a discount of 25% of the list price. She wants to mark them at a regular price so that she can give a discount of 20% of the marked price and still make a markup of 25% of the selling price.

(a) At what percent of the list price should she mark the regular selling price of the goods?

(b) Suppose the merchant decides she must make a markup of 25% of the cost price. At what percent of the regular selling price should she mark the price of the goods?