[求助]求助一道关于垄断的英文题

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应该是最基本的，本人是新手，这学期才学的．

Suppose you are in charge of a toll bridge that is essentially cost-free. The demand for bridge crossings, Q, is given by P=12-2Q,

a) What is the socially optimal price for crossing the bridge?How many people will cross the bridge at that price?

b) if you were a monopolist, what price would you charge?

c) what is the elasticity of demand at the monopoly price?

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关键词：elasticity MONOPOLIST Essential Crossing Socially 英文 垄断

一个是p=mc，还有一个是p=mr

让我谈谈我的拙见吧:

the first answer is 0=12-2Q .so Q=6.

the second answer is R=(12-2Q)*q . because it's monopoloy,

MR=LAC, so 12-4Q=0 ,Q=3.

the third answer is dP=-2dQ ,dQ/dP=-1/2 ,E=-1.

请学长指教．希望能与我联系．nannanmei@163.com

解的不错,虽然弹性其实不用解,肯定是1