Solve the formula c = pi d for d A. d = pi c
B. d = c/pi
C. d = c - pi
D. d = pi/c

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%?