Jack's demand : P = 20 CLOlQ Jill's demand : P = 15 - 0.00511 a) Derive and graph the AD curve if this is a private good . b) Derive and graph the AD curve if this is a public good. :2) If MC = $10, what is (1* for a private and public good ? 4. Net present value question . A new sewage system will take one year to build at a cost of $200 million . It will provide annual benefits of $5 million for the next 50