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On a certain sum and a certain rate percent, the SI for the first year is Rs270. and the CI for the first two years is Rs 580.50.find the sum n the rate percent.
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 1.In fig, a square OABC is inscribed in a quadrant OPBQ of a circle. If OA = 20 cm, find the area of the shaded region. (Use π = 3.14)
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