Nishant, Tavieen and Manas are confused with the formula for deriving TC:
• Nishant says: `TC = TVC + TFC`
• Tavleen says: `TC = AC xx "Output"`
• Manas says: `TC = sumMC + TFC`
Identify who amongst them is correct.

Answer the following question: (i) Why does AFC curve never touch the X-axis ? (ii) Why does TVC curve start from origin? (iii) Why AC, AVC and MC curves are U-shaped ? (iv) Why are the gap between TC curve and TVC curve remains constant with rise in output ? (v) Why does AC curve lie above the AVC curve ? (vi) Why does TC curve and TFC curve start from the same point above the origin?