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D( i )
i-0.03 = 0
i = 0
i-0.03 = 0
i-0.03 = 0
i-0.03 = 0 // + 0.03
i = 0.03
i = 0
i = 0
i in (-oo:0) U (0:0.03) U (0.03:+oo)
1000/i = 600/(i-0.03) // - 600/(i-0.03)
1000/i-(600/(i-0.03)) = 0
1000/i-600*(i-0.03)^-1 = 0
1000/i-600/(i-0.03) = 0
(-600*i)/(i*(i-0.03))+(1000*(i-0.03))/(i*(i-0.03)) = 0
1000*(i-0.03)-600*i = 0
400*i-30 = 0
(400*i-30)/(i*(i-0.03)) = 0
(400*i-30)/(i*(i-0.03)) = 0 // * i*(i-0.03)
400*i-30 = 0
400*i-30 = 0 // + 30
400*i = 30 // : 400
i = 30/400
i = 3/40
i = 3/40
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