Atennis supply store pays a wholesaler $90 for a tennis racquet and sells it for $144. what is the markup rate? show your work.

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.