The value of a machine depreciates every year at the rate of 10% on its value at the beginning of that year. If the current value of the machine is r 729, its worth 3years ago was:
Let the value of the machine 3 years ago be $$100x$$
Since, every year value decreases by 10%
=> Current value = $$(0.9)^3 * 100x = 729$$
=> $$100x = \frac{729}{0.729} = 1000$$
=> $$x = 10$$
=> Value 3 years ago = Rs. 1,000
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