Correct Answer: Option D

Explanation

P = S + \(\frac{sm^2}{nr}\)

P = S(1 + \(\frac{m^2}{nr}\))

P = S(1 + \(\frac{nr + m^2}{nr}\))

nrp = S(nr + m²)

S = \(\frac{nrp}{nr + m^2}\)

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