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The demand function for a monopolist is given by x=100−4px = 100 - 4p, then the marginal revenue, when x=6x=6 is (where xx is the number of units and pp is the price per unit)

Solution

✅ Correct Option: 1

From x=100−4px=100-4p we get p=25−x4p=25-\frac{x}{4}, so revenue is R=px=25x−x24R=px=25x-\frac{x^2}{4}. Then MR=dRdx=25−x2MR=\frac{dR}{dx}=25-\frac{x}{2}, which at x=6x=6 equals 25−3=2225-3=22.

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