HUBUNGAN
BIAYA MARJINAL DENGAN BIAYA RATA-RATA
Soal:
Jika TC = Q3 – 6Q2
+ 15Q
Buktikan bahwa biaya rata-rata minimum sama dengan biaya marjinal!
Solusi:
Biaya Marjinal = MC = TC’ = 3Q2
– 12Q + 15
Biaya Rata-Rata = AC =
= 


Biaya Rata-Rata minimum adalah pada
saat AC’ = 0



Q = 3 à Biaya
Rata-Rata Minimum
AC = 

AC = 

Q = 3 à Biaya
Marjinal
MC = 3Q2 – 12Q + 15
MC = 3(3)2 –
12(3)+ 15 = 6
Terbukti bahwa biaya rata-rata minimum sama dengan biaya
marjinal sebesar 6.
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