However, in Option (a), 4 and 125 do not follow the same pattern. \( 4^3 = 64 \), not 125, making it the odd one out.
The correct answer is (a) 4, 125.
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?