The revenue for selling $x$ units of a product is $R = 40x$. The cost of producing $x$ units is $C = 20x + 10900$. In order to obtain a profit, the revenue must be greater than the cost, so we want to know, for what values of $x$ will this product return a profit.

To obtain a profit, the number of units must be greater than .

Your overall score for this problem is