To make a profit of $10, the box should sell out for $30+$10=$40. Divided by 50 bars, that's 80 cents per bar.
2/v+2=9
-2 -2
2/v=7
(2)2/v=7(2)
V=14
A) 8/40 = 1/5
b) 12/40 or 6/20
c) 26/40 or 13/20
5x5x5=125 so it could be x=5
The club would have to sell at least 6 t-shirts.