Mr. Stanton bought a cell phone at 80% of the regular price. The regular price of the phone was $450. Mr. Wilson bought the same cell phone but paid $500 for it. How much more did Mr. Wilson pay than Mr. Stanton?

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π