Juanita borrow $600 to purchase on the computer she was charged 7% interest for two years how much interest will Juanita pay

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.