(a) If the firm can only charge a single price, what is this firm's profits (when maximizing profits)? (b) If the firm can only charge a single price, what is remaining surplus available to the consumers? (c) Now suppose the firm is able to capture all consumer surplus by charging different prices to different customers. Now, what are the 4 firm's profits? (d) With multiple prices, what is the remaining surplus available to the consumers?