Mr Bhargava invested a sum of Rs. 72,500 on 1st Jan at a certain rate of interest. On 1st Sept,he invested Rs. 36,250 more - but at a rate twice the former. On 31st Dec, he earned Rs. 3,350 as interest from both the investments. Find the original rate of interest (%)?

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Mr Bhargava invested a sum of Rs. 72,500 on 1<span class='superscript'>st</span> Jan at a certain rate of interest. On 1<span class='superscript'>st</span> Sept,he invested Rs. 36,250 more - but at a rate twice the former. On 31<span class='superscript'>st</span> Dec, he earned Rs. 3,350 as interest from both the investments. Find the original rate of interest (%)?