calculate 'gross value added at factor cost' from the following data:
1. sales tax = (20)
2. sales =(400)
3. purchase of raw material =(250)
4. excise duty =(30)
5. change in stocks =(-40)
6. import of raw material = (12)
7. depreciation = (9)
GVAFC= Sales + Change in Stock - Intermediate Consumption - Net Indirect Taxes
= 400 + (-40) - 250 - (20 + 30)
= Rs 60