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SI-15. A certain principal is become 4 times at the rate of 10% per annum. Find Time?

SI-15. कोई राशि साधारण ब्याज की दर 10% से 4 गुना हो जाती है | समय ज्ञात कीजिये ?

A) 30 B) 10 C) 15 D) 20

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