What are the answers ? simple steps are enough

In Utopia, Uber sells miles of travel to senior citizens (s) and younger citizens (y) whose demand curves for Uber rides are given by the following equations Demand (s): Qs = 1000 - 75PS thousand miles Demand (y): Qy = (1000/2) - (75/2) Py thousand miles and the marginal cost is a constant $2 per mile for either kind of rider. 54. Suppose Uber decides to set a single price for both groups, and maximize profits accordingly. Then, Uber will sell [ Answer54 ] thousands of miles. 55. When a single price is set, Uber will charge a price of $ [ Answer55 ] per mile. 56. With a regulatory cost of $C, the government can implement a policy to completely eliminate the inefficiency due to the single-price monopoly. For the government to find it beneficial to implement the policy, C must be less than [ Answer56 ]. 57. Suppose Uber decides to set one price for each group, and maximize profits accordingly. Then, Uber will sell [ Answer57A ] thousands of miles to senior citizens at a price of $[ Answer57B ] per mile. 58. And, it will sell [ Answer58A ] thousands of miles to younger citizens at a price of $[ Answer58B ] per mile. 59. The total consumer surplus under Uber's single-price scheme is [ Answer59 ] thousands dollars LESS THAN the total consumer surplus under Uber's dual-price scheme