Martha, Sattam and Frank live together in an apartment. The respective demand curves for weekly hours of cleaning are given by: Martha: P: 8 0.70 Sattam: P: 24 - 0.70 Frank: P: 46.5 0.70 The marginal cost of supplying cleaning is $26.2 per hour. Suppose that Martha, Sattam and Frank had to individually and independently decide how many hours of cleaning to pay for. How many hours of cleaning will be purchased in this case