B

Given data

Fox jeans sell for $15 a pair and Pony jeans sell for $18 a pair.

Total discount = $9

So letz take discount % on fox jeans as X and discount % on pony jeans as Y

Also Since 3 pairs of FOX and 2 pairs of pony were sold.

45X + 36Y = 900 ------- 1

Sum of discount % = 22

SO X + Y = 22 ------- 2

Solvng 1 and 2 --- y = 10

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