Answer :
20% off from $18:
1 - 0.2 = 0.8
0.8 * $18 = $14.4
including tax:
1.05 * $14.4 = $15.12
so answer A
1 - 0.2 = 0.8
0.8 * $18 = $14.4
including tax:
1.05 * $14.4 = $15.12
so answer A