Xylia buys a blazer, a shirt, a jumpsuit and a sweater. The average cost of these items is $28. The total cost of the jumpsuit and the sweater is ³₅ of the total cost of the blazer and the shirt. If the blazer costs $13.50 and the sweater costs $18.60, find the difference in cost between the shirt and the jumpsuit.
Total cost of the 4 items
= 4 x 28
= $112

Total cost of the jumpsuit and the sweater = 3 u
Total cost of the blazer and the shirt = 5 u

Total cost of the 4 items
= 3 u + 5 u
= 8 u

8 u = 112

1 u = 112 ÷ 8 = 14

Total cost of the jumpsuit and the sweater
= 3 u
= 3 x 14
= $42

Cost of the jumpsuit
= 42 - 18.60
= $23.40

Total cost of the blazer and the shirt
= 5 u
= 5 x 14
= $70

Cost of the shirt
= 70 - 13.50
= $56.50

Difference in cost between the shirt and the jumpsuit
= 56.50 - 23.40
= $33.10

Answer(s): $33.10