Economics

Syed Farzan (CA IPCC) (748 Points)

07 June 2011  

A firms ATC is Rs.300 at 5 units of output and Rs.320 at 6 units of output. The MC of producing 6th unit is...?

a) Rs. 20      b) Rs. 120    c) Rs. 320   d) Rs. 420

Answer in the material is given as 420..

please explain..