A person invested (1)/(3) of his prinici...

A person invested `(1)/(3)` of his prinicipal at a simple interst of `7%` per annum, `(1)/(4)` of the principal at a simple interest of `8%` per annum and the rest at a rate of `10%` per annum in an association, so that he had earned `Rs561` annually. Find the principal of the person.

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