Usha buys a jumpsuit, a vest, a blouse and a skirt. The average cost of these items is $22. The total cost of the blouse and the skirt is ³₅ of the total cost of the jumpsuit and the vest. If the jumpsuit costs $14.70 and the skirt costs $12.80, find the difference in cost between the vest and the blouse.
Total cost of the 4 items
= 4 x 22
= $88

Total cost of the blouse and the skirt = 3 u
Total cost of the jumpsuit and the vest = 5 u

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

8 u = 88

1 u = 88 ÷ 8 = 11

Total cost of the blouse and the skirt
= 3 u
= 3 x 11
= $33

Cost of the blouse
= 33 - 12.80
= $20.20

Total cost of the jumpsuit and the vest
= 5 u
= 5 x 11
= $55

Cost of the vest
= 55 - 14.70
= $40.30

Difference in cost between the vest and the blouse
= 40.30 - 20.20
= $20.10

Answer(s): $20.10