A man invested an amount at 12% per annum simple interest and another amount at 10% per annum simple

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A man invested an amount at 12% per annum simple interest and another amount at 10% per annum simple interest. He received an annual interest of Rs. 2600. But, if he had interchanged the amounts invested, he would have received Rs. 140 less. What amount did he invest at the different rates

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