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The true discount on a certain sum of...

The true discount on a certain sum of money due `2 2/3` years hence, is Rs 150 and the simple interest on the same sum for the same time and at the same rate is Rs 200. Interest rate per annum is (a) 10% (b) 12% (c) `12 1/2%` (d) `8 1/2%`

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