Answer:
8 + y = 3y
8 = 3y - y
8 = 2y
8/2 = y
$810
LMK if you need an explanation.
2(½ x 3 x 4) + 3(10 x 4)
=2(½ x 12) + 3(40)
=2(6) +120
=12+120
=132