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Question 21 
Selling price = 18 + 18 x 36/100

Question 22

Discount price = 80 - 80x10/100

Selling price = discount price + discount price x 7/100
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21) 18×.36=6.48
6.48+18.00= 24.48 (B)

22) 80×.10= 8.00
80-8.00=72.00
72×0.07=5.04
72.00+5.04= 77.04 (B)

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