Penelope buys a skirt, a dress, a jumpsuit and a blazer. The average cost of these items is $33. The total cost of the jumpsuit and the blazer is ³₈ of the total cost of the skirt and the dress. If the skirt costs $15.50 and the blazer costs $12.10, find the difference in cost between the dress and the jumpsuit.
Total cost of the 4 items
= 4 x 33
= $132

Total cost of the jumpsuit and the blazer = 3 u
Total cost of the skirt and the dress = 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 jumpsuit and the blazer
= 3 u
= 3 x 12
= $36

Cost of the jumpsuit
= 36 - 12.10
= $23.90

Total cost of the skirt and the dress
= 8 u
= 8 x 12
= $96

Cost of the dress
= 96 - 15.50
= $80.50

Difference in cost between the dress and the jumpsuit
= 80.50 - 23.90
= $56.60

Answer(s): $56.60