Alocal video store estimates its average customer's demand per year is q = 20 − 4p, and it knows the marginal cost of each rental is $1.00. how much should the store charge for an annual membership in order to extract the entire consumer surplus via an optimal two-part pricing strategy?

Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after 1 hour? when will the pool water be 0.006% chlorine?