Arectangle has a length of 8 inches and a width of 5 inches. if its length is increased by 50% and its width is reduced by 25%, find the percent change in the area of the rectangle.

1. a music store marks up the instruments it sells by 30%. a. if the store bought a guitar for $45, what will be its store price? b. if the price tag on a trumpet says $104, how much did the store pay for it? c. if the store paid $75 for a clarinet and sold it for $100, did the store mark up the price by 30%?