Your weekly cost (in dollars) to manufacture x bicycles and y tricycles is C(x, y) = 21,000 + 50x + 60y + 0.5xy. Calculate and interpret dC/dx and dC/dy. Compute the marginal cost of manufacturing tricycles at a production level of 10 bicycles and 17 tricycles. Round to 2 decimal places. The marginal cost to manufacture bicycles is the partial derivative of C with respect to x. The marginal cost to manufacture tricycles is the partial derivative of C with respect to y. The marginal costs do depend on the production level, since the cost function is not linear.