Question 1165920
To break even x stereos at $150 each or 150x=16000+39.50x+53x. Revenue on left, cost on right.
Therefore, 57.50x=16000
x=278.26  or 279 stereos to break even

$6000 profit means the right side (cost function) becomes $22000
so 57.50x=22000
x=382.61 or 383 stereos.