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 Rs.729, its worth 3years ago was:
Options:
A . Rs.750.87
B . Rs.1000
C . Rs.947.10
D . Rs.800
Answer: Option B Answer: (b) Using Rule 18, If the price of machine 3years ago be Rs.x. then 729 = $x(1 -10/100)^3$ 729 = $x(9/100)^3$ ⇒ x = Rs.1000
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