Albert buys a jumpsuit, a windbreaker and a dress. The average cost of these items is $86. The cost of the dress is four times the total cost of the jumpsuit and the windbreaker. If the jumpsuit costs $30, find the difference in cost between the windbreaker and the dress.
Total cost of the 3 items
= 3 x 86
= $258

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

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

5 u = 258 

1 u = 258 ÷ 5 = 51.60

Total cost of the jumpsuit and the windbreaker = $51.60

Cost of the windbreaker 
= 51.60 - 30
= $21.60

Cost of the dress
= 4 u
= 4 x 51.60
= $206.40

Difference in cost between the windbreaker and the dress
= 206.40 - 21.60
= $184.80

Answer(s): $184.80