Transform the following into equations: 1. you want to buy three books that are on sale at 20% off. the original prices of the books are $2.50, $4.95, and $6.00. how much will you save? 2. you are purchasing four items and want to calculate the tax. the items cost $2.50, $8.75, $3.00, and $10.25. the tax rate is 6%. how much is the tax? 3. you exercised 24 hours each month for a year. how many hours did you exercise by the end of the year? you may be able to do the math mentally to expanded notation and the distributive property 4. find the perimeter of a rectangular area with a length of 13 inches and a width of 7 inches.