Molly was packing books in a box to send to a friend. the box cannot weigh more than 2kg. if each book has a mass of 200g, what is the maximum number of books she can send?

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.