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Rahul too loan 40% of the whole at 15% per annum., half of rest at 10% per annum also, the remaining at 18% per annum Simple Interest . What is the effective rate of interest?

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Rahul too loan 40% of the whole at 15% per annum., half of rest at 10% per annum also, the remaining at 18% per annum Simple Interest . What is the effective rate of interest?






 
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