वार्षिक ४.५ प्रतिशतका दरले ४५० रुपैयाँको कति समयमा साधारण व्याज रु. ८१ हुन्छ ? / How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?
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