Risa buys a dress, a jacket, a blouse and a windbreaker. The average cost of these items is $36. The total cost of the blouse and the windbreaker is ³₅ of the total cost of the dress and the jacket. If the dress costs $17.60 and the windbreaker costs $11.10, find the difference in cost between the jacket and the blouse.
Total cost of the 4 items
= 4 x 36
= $144

Total cost of the blouse and the windbreaker = 3 u
Total cost of the dress and the jacket = 5 u

Total cost of the 4 items
= 3 u + 5 u
= 8 u

8 u = 144

1 u = 144 ÷ 8 = 18

Total cost of the blouse and the windbreaker
= 3 u
= 3 x 18
= $54

Cost of the blouse
= 54 - 11.10
= $42.90

Total cost of the dress and the jacket
= 5 u
= 5 x 18
= $90

Cost of the jacket
= 90 - 17.60
= $72.40

Difference in cost between the jacket and the blouse
= 72.40 - 42.90
= $29.50

Answer(s): $29.50