Out of Rs. 75000 a lady lends Rs. 15000 at \(7\frac{1}{2}\% \) per annum simple interest and Rs. 36000 at 8% per annum simple interest. She lends the remaining money at a certain rate of interest so that she gets total annual interest of Rs. 6885. The rate of interest per annum, at which the remaining money is lent, is
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