Find the annual rate of interest, to get a perpetuity of Rs. 675 for every half yearly from the present value of Rs. 30,000

Find the amount of an ordinary annuity of 12 monthly payments of Rs. 1, 500 that earns interest at 12% per annum compounded monthly. [(1.01)¹² = 1.1262 ]

Find the present value of an annuity of Rs. 900 payable at the end of 6^th months for 6 years. The money compounded at 8% per annum. [(1.04)^–12 = 0.6252 ]

A man buys 500 shares of amount Rs. 100 at Rs. 14 below par. How much money does he pay?

Which is better investment: 12% Rs. 20 shares at Rs. 16 (or) 15% Rs. 20 shares at Rs. 24.