Calculate the value of 'Sales' from the following data : State and explain any two precautions that must be taken while estimating national income by income method. S. No. | Particulars | Amount (in Rs. lakh) (i) | Subsidies | 200 (ii) | Operating surplus | 500 (iii) | Opening stock | 100 (iv) | Closing stock | 600 (v) | Intermediate consumption | 3,000 (vi) | Consumption of fixed capital | 700 (vii) | Profits | 750 (viii) | Net Value Added at Factor Cost (NVA_FC) | 2,000