The firm will breakeven when 20 units of the good is produced.
Cost is given as C = 50x + 400
Revenue is given as: R = 70x
In this case, the point of breakeven will be:
Cost = Revenue
50x + 400 = 70x
Collect like terms
70x - 50x = 400
20x = 400
Divide both side by 20
20x/20 = 400/20
x = 20
There will be breakeven at 20 units
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