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If the supply curve is p=9+xp = \sqrt{9+x} and the quantity sold in market is 7 units, then the producer's surplus will be

Solution

✅ Correct Option: 3

At x0=7x_0 = 7, p0=16=4p_0 = \sqrt{16} = 4, so revenue =28= 28.

Producer's surplus =p0x0−∫079+x dx=28−[23(9+x)3/2]07= p_0x_0 - \int_0^7\sqrt{9+x}\,dx = 28 - \left[\dfrac{2}{3}(9+x)^{3/2}\right]_0^7.

This equals 28−23(64−27)=28−743=10328 - \dfrac{2}{3}(64-27) = 28-\dfrac{74}{3} = \dfrac{10}{3}.

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