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The value k of a machine depreciates every year at the rate of 10% on its value at the beginning of that year. If the present value of the machine is Rs.729, its worth 3 years ago was :

Rs.947.10
Rs.800
Rs.1000
Rs.750.87
Explanation:

P=(1−10100)3=729(1−10100)3=729
P=Rs.(729×10×10×109×9×9)(729×10×10×109×9×9)=Rs.1000
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