The monthly demand curve for playing tennis at a particular club is given by the following equation: P_{Tennis Match} = 9 0.20 Q_{Tennis Match}. The club currently charges members $4.00 to play a match but is considering adding a membership fee. If the club continues to charge the same per play charge, the most that it will be able to charge as a membership fee is closest to:

1. $62.50.
2. $162.50.
3. $40.00.