Question

help last one

Answer 1

@DanJS

Answer 2

is it 12

Answer 3

yeah, the second expression is the one where he uses the Total Purchase discount 'z'

(1- z)*(3 + 4 + 5)

The (3 + 4 + 5) part is the cost of the items together, the (1 - z) is the percent of that to be paid..