If the true discount on Rs. 161 due 21/ years hence be Rs.

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If the true discount on Rs. 161 due 2¹/ years hence be Rs. 21. At what rate per cent is the interest calculated ?

1. 6%
2. 4%
3. 8%
4. 12%

Correct Option: A

Required rate percent = (100 x 21) / {(161 - 21) x 2¹/₂} = 6%