Harry and Cole had $104 and $89 respectively. Each of them bought a blouse and a jacket at the same price. The cost of the blouse was 3 times as much as the jacket. In the end, Harry had 4 times as much money as Cole. What was the difference between the cost of the jacket and the blouse?

	Harry	Cole	Difference
Before	$104	$89	$15
Change	- 4 p	- 4 p
After	4 u	1 u	3 u

Since Harry and Cole bought the same items at the same price, the difference in the amounts they had remains unchanged at first and in the end.

4 u - 1 u = 104 - 89
3 u = 15

1 u = 15 ÷ 3 = 5

Cost of 1 blouse = 3 p
Cost of 1 jacket = 1 p

Total cost of 1 blouse and 1 jacket
= 3 p + 1 p
= 4 p

4 p = 89 - 5
4 p = 84

1 p = 84 ÷ 4 = 21

Difference in the cost between the blouse and the jacket
= 3 p - 1 p
= 2 p
= 2 x 21
= $42

Answer(s): $42