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Under the Rural Housing Scheme, the Delhi Development Authority (DDA) allotted a house to Kamal Raj for Rs. 126100. This payment is to be made in three equal annual instalments. If the money is reckoned at 5% per annum compound interest, then how much is to be paid by Kamal Raj in each instalment ?

a) Rs. 45205
b) Rs. 46305
c) Rs. 47405
d) Rs. 48505

Answer: b
Explanation: Let the value of each instalment be Rs. x
Then, (P.W. of Rs. x due 1 year hence) + (P.W. of Rs. x due 2 year hence) + (P.W. of Rs. x due 3 year hence) = 126100
$$\eqalign{ & \frac{x}{{\left( {1 + \frac{5}{{100}}} \right)}} + \frac{x}{{{{\left( {1 + \frac{5}{{100}}} \right)}^2}}} + \frac{x}{{{{\left( {1 + \frac{5}{{100}}} \right)}^3}}} = 126100 \cr & \frac{{20x}}{{21}} + \frac{{400x}}{{441}} + \frac{{8000x}}{{9261}} = 126100 \cr & \frac{{8820x + 8400x + 8000x}}{{9261}} = 126100 \cr & \frac{{25220x}}{{9261}} = 126100 \cr & x = \left( {\frac{{126100 \times 9261}}{{25220}}} \right) \cr & x = 46305 \cr} $$

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