Fox jeans regularly sell for $15 a pair and Pony jeans regularly sell for $18 a pair. During a sale these regular unit prices are discounted at different rates so that a total of $9 is saved by purchasing 5 pairs of jeans: 3 pairs of Fox jeans and 2 pairs of Pony jeans. If the sum of the two discounts rates is 22 percent, what is the discount rate on Pony jeans?  Pick:
A) 9%
B) 10%
C) 11%
D) 12%
E) 13%
Let X be the percentage decrease in fox jeans   pony jeans = 22- X   (15*x/100)*3 + (18(22-X)/100)*2 = 9 ........... given   45X/100 + 792-36x/100 = 9   9x+792/100 = 9   9x+ 792 = 900   9x= 108   X = 12 = fox jeans   hence pony jeans = 22-12= 
<gadget id="calculator">22-12</gadget>
<output>10</output>
10   ANSWER:10%
<result>B</result>
Fox jeans regularly sell for $15 a pair and Pony jeans regularly sell for $18 a pair. During a sale these regular unit prices are discounted at different rates so that a total of $9 is saved by purchasing 5 pairs of jeans: 3 pairs of Fox jeans and 2 pairs of Pony jeans. If the sum of the two discounts rates is 22 percent, what is the discount rate on Pony jeans?