If the simple interest on a certain sum for 1 year 3 months at 8 1 2 % per annum exceeds the simple interest on the same sum for 8 months at 7 1 2 % per annum by ` 45, then the sum is:

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If the simple interest on a certain sum for 1 year 3 months at 8 1 2 % per annum exceeds the simple interest on the same sum for 8 months at 7 1 2 % per annum by ` 45, then the sum is: