Question 1162864
costs are $1500+3x, where x = number of shirts
revenue is 10x
Break-even is where the two equal or $1500+3x=10x
7x=1500
x=214.28 
Since there can't be a fractional shirt, at 214 he doesn't quite break-even and at 215 shirts, he has broken-even. I would use 215.