The value of a property depreciates every year by 10% of

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The value of a property depreciates every year by 10% of its value at the beginning of the year. The present value of the property is ₹ 8100. What was its value 2 years ago ?

1. ₹ 10,000
2. ₹ 90 ² × 8100
  100
3. ₹ 100 ² × 8100
  110
4. ₹ 9801

Correct Option: A

Using Rule 18,
Suppose the value of property two years ago was ₹ x
According to question

∴ x		1 -	10		²	= 8100
			100

⇒ x			90		²	= 8100
			100

=	8100 × 10 × 10	= ₹ 10000
	9 × 9