Isaac makes chairs in a small shop for which he pays $760 per month in rent. The materials cost $70 per chair, and he sells the chairs for $380 each. Isaac's other monthly expenses total $720.

Let x be the number of chairs that he need to sell.

Revenue = 380x

Variable cost = 70x

Fixed cost = 760+720 =1480

Profit = 380x-70x-1480 =310x-1480

310x-1480 > =0 to be viable

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