The value of the machine depreciates at the rate 10% per annum. If its present value is Rs.162000. What was the value of the machine 2 years ago? (a)Rs.100000 (b)Rs.15000 (c)Rs.200000 (d)Rs.250000

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How many perfect cubes can you find from 1 to 100? How many from -100 to 100?