Radha deposited ₹ 400 per month in a recurring deposit account for 18 months. The qualifying sum of money for the calculation of interest is ______.

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Radha deposited ₹ 400 per month in a recurring deposit account for 18 months. The qualifying sum of money for the calculation of interest is ₹ 68,400. Explanation: Given: Monthly deposit (P) = ₹ 400 Duration (n) = 18 months The qualifying sum of money can be calculated using the formula for the total amount deposited in an RD account: Qualifying sum = P xx n xx ((n + 1)/2) = 400 xx 18 xx ((18 + 1)/2) = 400 $\times$ 18 $\times$ 9.5 = 68,400

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