work out mary's total takings.
40*16 + 50 * 8 = 640 + 400 = 1040
2.how much profit does she make?
40*16 *40% + 50*8*30% = 640*40% + 400*30% = 256 + 120 = 376
work out mary's total takings.
40*16 + 50 * 8 = 640 + 400 = 1040
2.how much profit does she make?
40*16 *40% + 50*8*30% = 640*40% + 400*30% = 256 + 120 = 376