The price elasticity of demand for plane rides is 0.5The price elasticity of demand for train

rides is 0.2

The cross elasticity of demand for train rides with respect to the price of a plane ride is 0.4

If the price of a plane ride rises by 10 percent, the percentage change in the price of a train ride that will lead to no change in the quantity demanded of train is ——%

Please help me to find the formula to solve this problem. Please explain in detail.

Thanks.

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