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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 ₹ 729, its worth 3 years ago was:
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- ₹ 1000
- ₹ 750.87
- ₹ 947.10
- ₹ 800
Correct Option: A
Using Rule 18,
If the price of machine 3 years ago be ₹ x. then
| 729 = x |  | 1 - |  | 3 | ||
| 100 |
| ⇒ 729 = x | | | 3 | ⇒ x = ₹ 1000 | ||
| 10 |
