Question 1172780
<br>
x = cost for small parcel
y = cost for medium parcel
2x = cost for large parcel<br>
6 small, 8 medium, 9 large:
6(x)+8(y)+9(2x) = 173.20
24x+8y = 173.20 (1)<br>
7 small, 13 medium, 17 large:
7(x)+13(y)+17(2x) = 291.05
41x+13y = 291.05 (2)<br>
Simplify (1) to 3x+y = 21.65 (3)<br>
Multiply by 13: 39x+13y = 281.45 (4)<br>
Compare (2) and (4): 2x = 9.60  -->  x = 4.80<br>
Plug x = 4.80 into any earlier equation to find y = 7.25<br>
ANSWER:
3(x)+9(y)+2(2x) = 7x+9y = 7(4.80)+9(7.25) = 98.85<br>