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400 = 850-12t-3t² - (150+8t+2t²)
= 700 - 20t - 5t²
5t²+20t-300 = 0
------------------------- : 5
t² + 4t - 60 = 0
(t +10)(t - 6) = 0
t= -10 dan t = 6
nilai t = 6 yang memenuhi
13. untung jika C(t) < R(t)
150+8t+2t² < 850-12t-3t²
5t²+20t - 700 < 0
------------------------- : 5
t² + 4t - 140 < 0
(t + 14 ) (t - 10) = 0
t = -14 dan t = 10
ambil t = 10
sehingga batasannya 3 ≤ t < 10
14. rentang batasaan tidak untung 10 ≤ t ≤ 14
ambil t = 10
R(10) = 850-12(10)-3.10²
= 850 - 120 - 300
= 430
saat t = 14
R(14) = 850 - 12(14)-3.14²
= 850 - 168 - 588
=94
sehingga tidak untung tertinggi sebesar 430.