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A pressure cooker is sold for Rs 600 cash or Rs 300 cash down payment followed by Rs 310 after one month. The annual rate of interest is (1) \(40 \%\) (2) \(30 \%\) (3) \(33 \%\) (4) \(20 \%\)

A sum of Rs 64890 is to be paid back in 3 equal annual instalments. If the interest is compounded annually at the rate of \(6 \frac{2}{3} \%\) p.a, then each instalment is (in rupees) (1) 26476 (2) 25326 (3) 22600 (4) 24576

A microwave oven is available for Rs 4500 cash or for Rs 2100 cash down payment followed by three equal monthly instalments. If the shop keeper charges interest at the rate of \(10 \%\) p.a., compounded every month, find the total of the present values of the three instalments. (1) \(\mathrm{Rs} 1800\) (2) \(\operatorname{Rs} 2400\) (3) \(\mathrm{Rs} 4500\) (4) \(\operatorname{Rs} 2100\)