Brandon buys a dress, a jumpsuit and a windbreaker. The average cost of these items is $48. The cost of the windbreaker is four times the total cost of the dress and the jumpsuit. If the dress costs $12, find the difference in cost between the jumpsuit and the windbreaker.
Total cost of the 3 items
= 3 x 48
= $144

Total cost of the dress and the jumpsuit = 1 u
Cost of the windbreaker = 4 u

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

5 u = 144 

1 u = 144 ÷ 5 = 28.80

Total cost of the dress and the jumpsuit = $28.80

Cost of the jumpsuit 
= 28.80 - 12
= $16.80

Cost of the windbreaker
= 4 u
= 4 x 28.80
= $115.20

Difference in cost between the jumpsuit and the windbreaker
= 115.20 - 16.80
= $98.40

Answer(s): $98.40