Harry and Bobby had $215 and $147 respectively. Each of them bought a skirt and a blouse at the same price. The cost of the skirt was 4 times as much as the blouse. In the end, Harry had 5 times as much money as Bobby. What was the difference between the cost of the blouse and the skirt?

	Harry	Bobby	Difference
Before	$215	$147	$68
Change	- 5 p	- 5 p
After	5 u	1 u	4 u

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

5 u - 1 u = 215 - 147
4 u = 68

1 u = 68 ÷ 4 = 17

Cost of 1 skirt = 4 p
Cost of 1 blouse = 1 p

Total cost of 1 skirt and 1 blouse
= 4 p + 1 p
= 5 p

5 p = 147 - 17
5 p = 130

1 p = 130 ÷ 5 = 26

Difference in the cost between the skirt and the blouse
= 4 p - 1 p
= 3 p
= 3 x 26
= $78

Answer(s): $78