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 Rs. 8100. What was its value 2 years ago ?
A. Rs. 10000
B. Rs. $${\left( {\frac{{90}}{{11}}} \right)^2} \times 100$$
C. Rs. $${\left( {\frac{{100}}{{101}}} \right)^2} \times 8100$$
D. Rs. 9801
Answer: Option A
Solution(By Examveda Team)
10% = $$\frac{1}{10}$$\[\begin{gathered} {\text{Initial }}\,\,\,\,\,\,{\text{Final}} \hfill \\ \,\,\,{\text{10}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,9 \hfill \\ \,\,\,10\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,9 \hfill \\ \overline {\,\,100\,\,\,\,\,\,\,\,\,\,\,\,\,81\,\,\,} \hfill \\ \end{gathered} \]
⇒ 81 units = Rs. 8100
⇒ 1 unit = Rs. 100
⇒ 100 units = Rs. 10000
⇒ Value of property 2 years ago
⇒ Rs. 10000
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