Yoko buys a coat, a jumpsuit, a blazer and a sweater. The average cost of these items is $33. The total cost of the blazer and the sweater is ³₈ of the total cost of the coat and the jumpsuit. If the coat costs $15.40 and the sweater costs $14.90, find the difference in cost between the jumpsuit and the blazer.
Total cost of the 4 items
= 4 x 33
= $132

Total cost of the blazer and the sweater = 3 u
Total cost of the coat and the jumpsuit = 8 u

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

11 u = 132

1 u = 132 ÷ 11 = 12

Total cost of the blazer and the sweater
= 3 u
= 3 x 12
= $36

Cost of the blazer
= 36 - 14.90
= $21.10

Total cost of the coat and the jumpsuit
= 8 u
= 8 x 12
= $96

Cost of the jumpsuit
= 96 - 15.40
= $80.60

Difference in cost between the jumpsuit and the blazer
= 80.60 - 21.10
= $59.50

Answer(s): $59.50