The firm will breakeven when 40 units of the good is produced.
Cost is given as C = 40x + 400
Revenue is given as: R = 50x
In this case, the point of breakeven will be:
Cost = Revenue
40x + 400 = 50x
Collect like terms
50x - 40x = 400
10x = 400
Divide both side by 20
10x/10 = 400/10
x = 40
There will be breakeven at 40 units
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