Glen buys a skirt, a blouse and a windbreaker. The average cost of these items is $52. The cost of the windbreaker is four times the total cost of the skirt and the blouse. If the skirt costs $16, find the difference in cost between the blouse and the windbreaker.
Total cost of the 3 items
= 3 x 52
= $156

Total cost of the skirt and the blouse = 1 u
Cost of the windbreaker = 4 u

Total cost of the 3 items 
= 1 u + 4 u
= 5 u

5 u = 156 

1 u = 156 ÷ 5 = 31.20

Total cost of the skirt and the blouse = $31.20

Cost of the blouse 
= 31.20 - 16
= $15.20

Cost of the windbreaker
= 4 u
= 4 x 31.20
= $124.80

Difference in cost between the blouse and the windbreaker
= 124.80 - 15.20
= $109.60

Answer(s): $109.60