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There are only 3 consumers (X, Y and Z) ...

There are only 3 consumers (X, Y and Z) in a market and there demand functions are given as : `Q_(X) = 30 - 2P , Q_(Y) = 40 - 3P , Q_(Z) = 50 - 4P`
From the given individual demand functions, determine the market demand function. Also, calculate the market demand at a price Rs. 10 per unit.

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