Min buys a shirt, a sweater, a jumpsuit and a windbreaker. The average cost of these items is $44. The total cost of the jumpsuit and the windbreaker is ³₈ of the total cost of the shirt and the sweater. If the shirt costs $18.60 and the windbreaker costs $10.90, find the difference in cost between the sweater and the jumpsuit.
Total cost of the 4 items
= 4 x 44
= $176

Total cost of the jumpsuit and the windbreaker = 3 u
Total cost of the shirt and the sweater = 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 jumpsuit and the windbreaker
= 3 u
= 3 x 16
= $48

Cost of the jumpsuit
= 48 - 10.90
= $37.10

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

Cost of the sweater
= 128 - 18.60
= $109.40

Difference in cost between the sweater and the jumpsuit
= 109.40 - 37.10
= $72.30

Answer(s): $72.30