You can put this solution on YOUR website! I = PN / (RN + A)
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reverse equality so N is on the left side
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PN / (RN + A) = I
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multiply by (RN + A), (RN + A) not = 0
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PN = I * (RN + A)
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PN = IRN + IA
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PN - IRN = IA
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N * (P - IR) = IA
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divide both sides of = by (P - IR) not = 0
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N = IA / (P - IR)
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