灵鹊做题网71.In the blackberry market,the quantity demanded is given b
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71.
In the blackberry market,the quantity demanded is given by QD = 2,600 – 500P,and the quantity supplied is given by QS = –400 + 100P.What is the equilibrium price and equilibrium quantity?
A)
$5 and 100 pounds
B)
$4.25 and 3,000 pounds
C)
$2.50 and 900 pounds
D)
$1.80 and 2,200 pounds
求具体解答71.
In the blackberry market,the quantity demanded is given by QD = 2,600 – 500P,and the quantity supplied is given by QS = –400 + 100P.What is the equilibrium price and equilibrium quantity?
A)
$5 and 100 pounds
B)
$4.25 and 3,000 pounds
C)
$2.50 and 900 pounds
D)
$1.80 and 2,200 pounds
求具体解答71.
71.
所谓equilibrium是指QD=QS吧?需求和供给平衡.所以有：
2600-500P = -400+100P
3000-500P = 100P
3000 = 600P
P = 3000/600 = 5（此为equilibrium price）
将P = 5代入QD中：QD = 2600-500(5) = 100（此为equilibrium quantity）
所以选A.
其他两张看得清楚题看不清插图啊.
再问：
哪里看不清楚 告诉我
82题第一个图左边的supply线是Sprivate 右边是Stotal private=pub,golf（大概是这样）
再答： 81. D) $200
600 - 400 = 200
82. B) 200 per week
1000 - 800 = 200
这两道题都是问在两种不同情况（supply线）下equilibrium price的差
所谓equilibrium是指QD=QS吧?需求和供给平衡.所以有：
2600-500P = -400+100P
3000-500P = 100P
3000 = 600P
P = 3000/600 = 5（此为equilibrium price）
将P = 5代入QD中：QD = 2600-500(5) = 100（此为equilibrium quantity）
所以选A.
其他两张看得清楚题看不清插图啊.
再问：
哪里看不清楚 告诉我82题第一个图左边的supply线是Sprivate 右边是Stotal private=pub,golf（大概是这样）
再答： 81. D) $200
600 - 400 = 200
82. B) 200 per week
1000 - 800 = 200
这两道题都是问在两种不同情况（supply线）下equilibrium price的差
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