pake cara ya, makasihh

Biaya Maginal C' = 30 + 0,5 t
Fungsi biaya total =C  = ∫c' (dt)
C(t) = 30 t + 1/4 t² + c
C(10)= 3.500 --> 30(10) + 1/2(10²) + c = 3.500
300 + 50 + c = 3.500
c = 3.150

C(t) = 30t + 1/4 t² + 3.150
biaya untuk 500 unit --> C(500) = 30(500)+ 1/4 (500)² + 3.150
biaya = 80.650