Answer :
6.45 x .08 = .516 = .52
6.45 + .52 = 6.97
6.97 x .20 = 1.394 = 1.39
6.97 + 1.39 = 8.36
He would pay $8.36.
6.45 + .52 = 6.97
6.97 x .20 = 1.394 = 1.39
6.97 + 1.39 = 8.36
He would pay $8.36.