buktikan bahwa untuk fungsi biaya total C=0,5Q³-20Q²+25Q, biaya rata-rata minimum sama dengan biaya marginal.
Diketahui :
- C = 0,5Q³ - 20Q² + 25Q
Ditanya :
- MC = AC minimum
Penyelesaian :
C = 0,5Q³ - 20Q² + 25Q
C' = 1,5Q² - 40Q + 25
MC = C'
MC = 1,5Q² - 40Q + 25
AC = C/Q
AC =
[tex] \frac{ {0.5q}^{3 } - {20q}^{2} + 25q }{q} \\ = {0.5q}^{2} - 20q + 25[/tex]
AC = 0,5Q² - 20Q + 25
Syarat AC minimum AC' = 0
AC ' = Q - 20
AC' = 0
Q - 20 = 0
Q = 20
MC = 1,5Q² - 40Q + 25
MC = 1,5(20)² - 40(20) + 25
MC = 600 - 800 + 25
MC = -175
AC = 0,5Q² - 20Q + 25
AC = 0,5(20)² - 20(20) + 25
AC = 200 - 400 + 25
AC = -175
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