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 ?
Options:
A . Rs.$(90/100)^2 × 8100$
B . Rs.10,000
C . Rs. $(100/110)^2 × 8100$
D . Rs.9801
Answer: Option B Answer: (b) Using Rule 18, Suppose the value of property two years ago was Rs.x According to question $x(1 - 10/100)^2 = 8100$ $x(90/100)^2 = 8100$ $x ={8100 × 10 × 10}/{9 × 9}$ = Rs.10000
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