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The demand function of a certain commodi...

The demand function of a certain commodity is given by `p= 1000 - 25 x+x^(2)` where `0le x le20` . Find the price per unit and total revenue from the sale of 5 units.

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The correct Answer is:
`(p)_(x=5)= Rs 900; (R(x))_(x=5)= Rs 4500`
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