Cost Analysis A rival company manufactures fuel tanks for cars using a different production technique. The total weekly cost (in dollars) of producing x tanks is given by ... C(x) = 10000 +90x -0.07x2 Find the marginal cost at a production level of 500 fuel tanks per week to approximate the cost of the 501st unit (Round to the nearest 2 decimal places, if needed) HINT: Steps to find the approximate or estimate (cost/revenue/profit) 1. Find C'(x) = MC (500); 2. take the derivative of the cost/revenue/profit function; 3. plug in 500 for x