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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(100-y)/y = 0.05 // - 0.05
(100-y)/y-0.05 = 0
(100-y)/y+(-0.05*y)/y = 0
100-y-0.05*y = 0
100-1.05*y = 0
(100-1.05*y)/y = 0
(100-1.05*y)/y = 0 // * y
100-1.05*y = 0
100-1.05*y = 0 // - 100
-1.05*y = -100 // : -1.05
y = -100/(-1.05)
y = 95.23809524
y = 95.23809524
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