Tiffany buys a blouse, a jumpsuit, a shirt and a coat. The average cost of these items is $33. The total cost of the shirt and the coat is ³₈ of the total cost of the blouse and the jumpsuit. If the blouse costs $17.40 and the coat costs $6.70, find the difference in cost between the jumpsuit and the shirt.
Total cost of the 4 items
= 4 x 33
= $132

Total cost of the shirt and the coat = 3 u
Total cost of the blouse 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 shirt and the coat
= 3 u
= 3 x 12
= $36

Cost of the shirt
= 36 - 6.70
= $29.30

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

Cost of the jumpsuit
= 96 - 17.40
= $78.60

Difference in cost between the jumpsuit and the shirt
= 78.60 - 29.30
= $49.30

Answer(s): $49.30