Solution:
Q MC FC VC TC AFC AVC ATC
0 NA 50 0 50 NA NA NA
1 50 50 50 105 50 50 105
2 19 50 64 104 20 32 52
3 85 40 149 189 13.33 49.67 63.00
4 223 40 372 412 10 93 103
TC=FC+VC
FC=40
VC=TC-FC
MC=change in TC
AFC=FC/Q
AVC=VC/0
ATC=TC/0
a) TC when 0=0 = 40 because FC = 40 remains constant and the firm still incurs a total cost equal to its FC when it produces zero output.
b) MC for first unit = 45
c) ATC of 3rd unit = 63
d) AVC for 4th unit = 93