We have to go backwards:
After the discount in July ( 50 % ), the cost of jeans is $25.50
So the price before this discount was 2 * $22.50 = $45
In June, the price was reduced by 25%.
45 ------------------75%
x --------------------100 %
45 : x = 75 : 100
45 * 100 = 75 x
4,500 = 75 x
x = 4,500 : 75
x = $60
Finally, in May the price was 250% of its wholesale cost.
60 ----------------- 250%
x -------------------100 %
60 : x = 250 : 100
6,000 = 250x
x = 6,000 : 250
x = $24
Answer: The cost of the jeans in the wholesale was $24.
