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25000 blood donors were registered with Red Cross in a city. The number of donors increased at the rate of 10% every 6 months. Find the total time (in years) at the end of which the total number of blood donors becomes 33275.

The value of an item depreciates $x\%$ per year. The present value of the item is $₹ 109350$. Its value after 3 years will be $₹ 79716.15$. Two years ago from now, its value, in rupees, was