80G: Donation-Deduction-Corporate Social Responsibility expenditure-Donation to approved institution-Allowable as deduction-Education cess-Not allowable as deduction-Dividend Distribution Tax-Not entitled to claim a lower rate of Dividend Distribution Tax under the DTAA, [S. 37(1), Expln. 2 40(a)(ii), 115-0, 234A, 234B, 234C)