Can y do the problem and show all work. I didn't understood the problem

Market (inverse) demand for measles vaccine is given by P = 100- 20. Market (invorso) supply for measles vaccine Is given by P = 10 + 0.50. Here, P is the unit price of measles vaccine and Q denotes quantity. Suppose there are positive externalities from consuming measles vaccines. Marginal oxtomal benefit is given by MEB . 0.50. The size of deadweight loss from the market equilibrium is 0.5x(-[b])x(0.5x[=])=[d]. Specified Answer for: a 45 Specified Answer for: b ) 36 Specified Answer for: c @ 36 Specified Answer for:d @ 81 Correct Answers for a Evaluation Method Correct Answer Case Sensitivity Exact Match 45 Correct Answers for b Evaluation Method Correct Answer Case Sensitivity Exact Match 36 Correct Answers for: c Evaluation Method Correct Answer Case Sensitivity Exact Match 36 Correct Answers for: d Evaluation Method Correct Answer Case Sensitivity Exact Match