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A consumer has utility function µ = u(x,y) which assigns utility numbers µ to baskets of...

A consumer has utility function µ = u(x,y) which assigns utility numbers µ to baskets of commodities (x,y) as follows:  
u(10,12) = 19, u(13,13) = 29, u(11,11) = 20, u(10,14) = 23, u(13,12) = 28  

Calculate Marginal Utility of x at (10,12) in approximate form. Please show your work.

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