Please help me, I feel so idiotic right now

Answer:
a) $8.80
b) 40%
Step-by-step explanation:
Part (a)
Given:
Original price - discounted price
= $22 - $13.20
= $8.80
Part (b)
percentage = (amount discounted ÷ original price) x 100
= (8.80 ÷ 22) x 100
= 40%