Answer:
for $16000 plan B is better than A
Explanation:
We are searching for the stage where Plan A's compensation is less than Plan B's compensation.
Plan A < Plan B
let total of Curt's sales be the x,
x is the basis of the commission under Plan A, but the first 5000 of sales are excluded i.e (x - 5000) from the basis of commissions under Plan B.
350 + x(0.10) < 750 + (x - 5000)(0.15)
800 -750 < (0.15) x - 5000(0.15) - (0.10)x
50 < (0.15 - 0.10)x - 750
50+750 < (0.05)x
800 < (0.05)x
16000 < x