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R = p*x = 20x*exp(-0.0002x)
let dR/dx = 0
20 *exp(-0.0002x) -0.004x*exp(-0.0002x)
20-0.004x = 0
x = 20/0.004 = 5000
R = 20*5000*exp(-0.2*5) = 100000/e = 36787.94
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