相信对于经济大牛这是个超简单的问题，但是我是刚开始学，有许多不懂的地方，求别拍 T T

Consider a market in which market demand is given by Qd=100−P. The market supply
function is given by Qs= P.

Suppose that the government introduces a per-unit tax of $10 on sellers on the sales of the
good, but that the tax only applies to the first 10 units sold (i.e., additional units pay no
tax).

a.  What is the equilibrium before the tax?
b.  How this specific tax will affect the supply and demand curves?
c.  What will be the equilibrium after the tax?
d.  What is the deadweight loss generated by this policy?

PS：对于刚开始学的孩子，大牛们可不可以推荐一点习题书，很多时候发现理论能看到，到具体问题就不会了。