Kindly solve

intermediate(ipc)course (no) (1460 Points)

08 April 2012  

a firms average total cost is 300 at 5 units of output & 320 at 6 units of output the marginal cost of producing the 6th unit is :

a).20                                                                                                                                                                   b).120

c).320                                                                                                                                                                  d)420.