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In how much time will the simple interest on a certain sum be 168 if it produces 21 as interest in 4 months at
half the rate?
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168 rupees / 10.5 rupees / month = 16 months. still another way. 21 rupees at half rate in 4 months means 21 rupees at full rate in 2 months. divide 168 by 21 to get 8 two month periods which is equal to 16 months.
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