S. 69C: Unexplained expenditure -Bogus purchases -Where the sales, quantitative stock records and consumption of goods are accepted, and the purchases are supported by invoices, delivery challans, bank payments and stock records, merely because the supplier is found to be non-genuine, the entire purchases cannot be disallowed- Only the profit element embedded in such purchases is liable to be taxed. In the case of a trader in ferrous and non-ferrous metals, estimation of profit at 2% of the disputed purchases is reasonable, and application of 12.5% is unjustified. [S. 145 ]