Jade buys a blouse, a skirt, a blazer and a jumpsuit. The average cost of these items is $28. The total cost of the blazer and the jumpsuit is ²₅ of the total cost of the blouse and the skirt. If the blouse costs $13.50 and the jumpsuit costs $14.20, find the difference in cost between the skirt and the blazer.
Total cost of the 4 items
= 4 x 28
= $112

Total cost of the blazer and the jumpsuit = 2 u
Total cost of the blouse and the skirt = 5 u

Total cost of the 4 items
= 2 u + 5 u
= 7 u

7 u = 112

1 u = 112 ÷ 7 = 16

Total cost of the blazer and the jumpsuit
= 2 u
= 2 x 16
= $32

Cost of the blazer
= 32 - 14.20
= $17.80

Total cost of the blouse and the skirt
= 5 u
= 5 x 16
= $80

Cost of the skirt
= 80 - 13.50
= $66.50

Difference in cost between the skirt and the blazer
= 66.50 - 17.80
= $48.70

Answer(s): $48.70