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shop A discount % → 20% shop A after discount 1 bottle → (100 - 20)% x 20 = $16
shop A after discount 8 bottles → 8 x 16 = $128
shop B
bottle on 50% off or discount → (100 - 50)% x 20 = $10
1 group of 3 bottles → 2 usual price + 50% off = 2 x 20 + 10 = $50
number of groups for 8 bottles → 8 ÷ 3 = 2 remainder 2
remainder 2 bottles → 2 x 20 = $40
total → 2 x 50 + 40 = $140
difference → 140 - 128 = $12