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If the discount is   u %, 

120  ( 100% – u%) –  90 ( 100% – u%)  = 24

30 (100 – u)/100 = 24

3000- 30u = 2400

30u = 600

u = 20

So the discountis 20%

Note: the selling price after discount is original selling price * ( 100% – 20%), in this case,

120(0.8) – 90(0.8) = 96-72 = 24

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