Anumber where 3 is worth 1/10 as much and 2 is worth 10 times as much as the number 431, 621

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.