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TC = AC. Q = Q² - 10Q
Keuntungan = TR - TC = 35Q + 4Q² - Q³ - Q² + 10 Q
K= -Q³ + 3Q² + 45 Q
tingkat harga K' = 0
- 3Q² + 6Q + 45 = 0
-3(Q + 5)(Q - 3) = 0
Q = -5 atau Q = 3
Q > 0 --> Q = 3
.
untuk Q = 3 --> K = -3³ + 3(-5)² + 45(3) = 135