Mr Navansh invests a certain sum of money at 6% per annum simple interest and another sum at 7% per annum simple interest. His income from interest after 2 years was Rs. 35,400. One-fourth of the first sum is equal to one-fifth of the second sum. The total sum invested was:

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Mr Navansh invests a certain sum of money at 6% per annum simple interest and another sum at 7% per annum simple interest. His income from interest after 2 years was Rs. 35,400. One-fourth of the first sum is equal to one-fifth of the second sum. The total sum invested was: