For the given cost $123 and markup = $87, complete the following parts. a. Find the rate of markup based on cost. b. Find the selling price. a. The rate of markup based on cost is %. (Round to the nearest tenth as needed.) b. The selling price is (Simplify your answer.) A wallet is marked up $9, which is a 50% markup based on cost. What is the cost of the wallet and the selling price of the wallet? The cost is $ (Simplify your answer. Type an integer or decimal rounded to the nearest hundredth as needed.) The selling price is $ (Simplify your answer. Type an integer or decimal rounded to the nearest hundredth as needed.) A lamp costs $24 and is marked up based on cost. If the lamp sold for $54, what was the percent of markup? The rate of markup is %