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A person lends 40% of his sum of money a...

A person lends 40% of his sum of money at 15% per annum, 50% of rest at 10% per annum and the rest at 18% per annum rate of interest. What would be the annual rate of interest. If the interest is calculated on the whole sum?(एक आदमी अपनी धनराशि का 40 % भाग 15 % वार्षिक की दर से , शेष का 50 % भाग 10 % वार्षिक दर से शेष भाग 18 % की दर से उधार देता है यदि कुल धनराशि पर बियाज की गणना करनी हो तो बियाज की वार्षिक दर कितनी होगी )

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