Step 1: To find the smallest number divisible by all these numbers, we need to find the least common multiple (LCM).
The LCM of 2, 3, 4, 5, 6, 7, 8, 9, and 10 is:
\[\text{LCM}(2,3,4,5,6,7,8,9,10) = 2520.\]
Conclusion: The smallest number divisible by all these numbers is 2520.
Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?