7. Mary sews for a clothing manufacturer. She is paid $7.50 per hour plus a piecework rate that depends on the type of garment in production. The current production run is men's shirts, for which she is paid $3.00 for each unit exceeding her quota of 20 shirts in an 8-hour shift. What is her total pay for a regular workweek in which her output on successive days is 24, 26, 27, 28, and 30 shirts