If line ab and cd are parallel, which of the following statements are true? a) they intersect at a single point b) they are perpendicular c) the are skew lines d) they are coplanar

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%?