S. 271(1)(c) : Penalty – Concealment – Information from sales-tax authorities – Bogus purchases – Hawala parties – Estimated additions – Quantum restricted to 12. 5% of bogus purchases – Penalty is leviable . [ S.69C ] S. 271(1)(c) : Penalty – Concealment – Information from sales-tax authorities – Bogus purchases – Hawala parties – Estimated additions – Quantum restricted to 12. 5% of bogus purchases – Penalty is leviable . [ S.69C ]