Which set is in order from smallest to largest? 0.4, 0.04, 0.0675, 0.6075, 0.006705 9.876, 9.877, none of the above

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%?