Emma buys a windbreaker, a shirt, a blazer and a skirt. The average cost of these items is $44. The total cost of the blazer and the skirt is ³₈ of the total cost of the windbreaker and the shirt. If the windbreaker costs $11.90 and the skirt costs $5.40, find the difference in cost between the shirt and the blazer.
Total cost of the 4 items
= 4 x 44
= $176

Total cost of the blazer and the skirt = 3 u
Total cost of the windbreaker and the shirt = 8 u

Total cost of the 4 items
= 3 u + 8 u
= 11 u

11 u = 176

1 u = 176 ÷ 11 = 16

Total cost of the blazer and the skirt
= 3 u
= 3 x 16
= $48

Cost of the blazer
= 48 - 5.40
= $42.60

Total cost of the windbreaker and the shirt
= 8 u
= 8 x 16
= $128

Cost of the shirt
= 128 - 11.90
= $116.10

Difference in cost between the shirt and the blazer
= 116.10 - 42.60
= $73.50

Answer(s): $73.50