需求彈性&交叉彈性 - 經濟

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題目:

The price of a plane ride rises by 10 percent.
The price elasticity of demand for plane rides is 0.7 and
the price elasticity of demand for train rides is 0.1.
The cross elasticity of demand for train rides with respect to
the price of a plane ride is 0.6

1.calculate the percentage changes in the quantity demanded of plane ride and
train rides.
2.given the rise in the price of a plane ride, what percentage change in the
price of a train ride will leave the quantity demanded of train rides unchanged?


我的想法:

plane Ed=0.7
train Ed=0.1
交叉彈性=0.6
求需求量變動多少?

x/10%=0.6 x=6%

第一題我是這樣想，但還是覺得好怪
第二題的話還請麻煩大家幫我想一下好嗎 謝謝 想了一天還是沒結果QQ

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