The list price of a book is $15. but if more than 12 copies are purchased, then the price per copy is reduced by $0.20 for every copy above 12. that is, $14.80 per copy for 13 copies, $14.60 per copy for 14 copies, and so on. how much do you save by buying 24 copies than if you bought 2 sets of 12?

The area of a square floor on a scale drawing is 64 square centimeters, and the scale drawing is 1 centimeter: 3 ft. what is the area of the actual floor? what is the ratio of the area in the drawing to the actual area? the area of the actual floor is square feet. the ratio of the area in the drawing to the actual area is 1 square centimeter: square feet.