22. A hardcover book originally priced at $45.50 is on sale for $36.40. What percent of the original cost is the sale price? 23. Sarah and Claudia spent $18, or 40% of their pocket money, on food. How much money did they have initially? 24. The dimensions of a rectangular room of a new house in a blueprint are 3.1cm by 4.3cm. If the scale is 1 centimeter = 1.5 meters, find the actual dimensions of the room.