Solaris is the sole supplier of solar panels in Sunnylandia. Solaris has no fixed costs and can supply solar panels at a constant marginal cost MC of $10 per panel. There are two different categories of customers of solar energy, business and residential. The businesses' demand for solar panels is Q_B(P) = 240 - 3P. The residential demand for solar panels is Q_R(P) = 80 - 5P.

a)Suppose that the government legislates that companies are no longer allowed to price-discriminate between the business and residential market customers; thus, the business and residential markets are combined. Show the combined demand using a diagram, then show and calculate the profit maximizing price and number of panels that Solaris will choose to sell in the combined market, as well as the firm's profit .

b)Which category of customers (i.e., business or residential) benefits from the market is now combined? Justify your answer.