The marginal cost function is MC(q)=300-10q, where 'q' is the number of tons of coffee produced. Fixed costs are $1000. The marginal revenue function is MR(q)=500-20q. The value of the profit function P(q) when q=25 is closest to? And the Average Cost when q=20 is closest to? And when the change in revenue if sales increase from 5 to 20 tons is closest to?