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9. Arun bought a pair of skates at a sale where the discount is given was 20%. If the amount he pays is ₹ 1,600, find the marked price.
Answer :

Let the marked price of the skates be ₹ 100
We are given discount = ₹ 20% of 100 = ₹ 20

So the Sale price =₹ 100 – ₹ 20 = ₹ 80

If SP is ₹ 80 then marked price =₹ 100

so,if SP is ₹ 1 then marked price = ₹ \(\frac { 100 }{ 80 }\)

Similarly, if SP is ₹ 1,600 then marked price = ₹ \(\frac { 100 }{ 80 } \times 1600 = ₹ 2,000\)

Hence, we got the marked price = ₹ 2000.