Roshel buys a blouse, a jacket, a coat and a shirt. The average cost of these items is $55. The total cost of the coat and the shirt is ³₈ of the total cost of the blouse and the jacket. If the blouse costs $11.20 and the shirt costs $9.40, find the difference in cost between the jacket and the coat.
Total cost of the 4 items
= 4 x 55
= $220

Total cost of the coat and the shirt = 3 u
Total cost of the blouse and the jacket = 8 u

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

11 u = 220

1 u = 220 ÷ 11 = 20

Total cost of the coat and the shirt
= 3 u
= 3 x 20
= $60

Cost of the coat
= 60 - 9.40
= $50.60

Total cost of the blouse and the jacket
= 8 u
= 8 x 20
= $160

Cost of the jacket
= 160 - 11.20
= $148.80

Difference in cost between the jacket and the coat
= 148.80 - 50.60
= $98.20

Answer(s): $98.20