Daniel's mother has a 15% discount coupon she plans to use at the grocery store today. after the discount is applied, how much will she pay for an item that originally costs $7.80, before applying sales tax?

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.