Kimberly buys a windbreaker, a blazer, a jacket and a skirt. The average cost of these items is $35. The total cost of the jacket and the skirt is ²₅ of the total cost of the windbreaker and the blazer. If the windbreaker costs $14.50 and the skirt costs $12.40, find the difference in cost between the blazer and the jacket.
Total cost of the 4 items
= 4 x 35
= $140

Total cost of the jacket and the skirt = 2 u
Total cost of the windbreaker and the blazer = 5 u

Total cost of the 4 items
= 2 u + 5 u
= 7 u

7 u = 140

1 u = 140 ÷ 7 = 20

Total cost of the jacket and the skirt
= 2 u
= 2 x 20
= $40

Cost of the jacket
= 40 - 12.40
= $27.60

Total cost of the windbreaker and the blazer
= 5 u
= 5 x 20
= $100

Cost of the blazer
= 100 - 14.50
= $85.50

Difference in cost between the blazer and the jacket
= 85.50 - 27.60
= $57.90

Answer(s): $57.90