Abag contains pennies, dimes, and quarters. there are 50 coins in all. of the 16% are pennies and 42% are dimes. there are 3 more nickels than pennies. how much money does the bag contain?

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%?