懂英语的 懂经济的 帮忙看一下这个题是否做的正确

The current equilibrium price in the market for gourmet chocolate is $5 per block. At this price, 1,000 blocks are sold. The price elasticity of demand is -.5 and the price elasticity of supply is 1 at the current price.

a) Solve for the equations of demand and supply, assuming that they are both
linear
##
Assume the equations of demand and supply,
Qd=a-bP
Qs=c+dP

∑d=-0.5,

∵ ∑d=-b•P/Qd
∴ -b•P/Qd = -b•5/1,000 =-0.5
b=100

∴Qd=a-100P

ηs= 1,

∵ ηs= d•P/Qs
∴ d•P/Qs = d•5/1,000 = 1
d=200

∴Qs=c+200P

At the equilibrium, P=5, Q=1,000 ,
Qd: 1,000=a-500
a=1500
Qd=1500-100P

Qs: 1,000=c+1000
c=0
Qs=200p

The equations of demand and supply:
Qd=1500-100P
Qs=200p
b) Assume that the equilibrium price decreases to $1 and, at this price 2,000
blocks are sold. The pric

求助专攻经济的朋友门帮忙！！进来看一下～ 懂经济的看一下，关于公司上市 帮忙看一下拉～～英语的选择题～～ 懂英语的人进来看一下。。。 懂英语的帮忙翻译一下 懂英语的帮忙翻译一下~ 懂英语的帮忙翻译一下!谢谢 懂英语的帮忙翻译一下，谢谢 懂英语的帮忙做一下题 懂韩语的帮忙看一下