Observing the given series, we identify the following pattern:
The pattern follows alternating increases, and the next increase should be +11:
47 +11 = 58
Conclusion: Thus, the next number in the series is 58

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?