Let’s analyze the pattern of the series. We observe that the terms are multiplying by increasing factors and adding a consistent value:
Following this pattern for the next term:
328 ×5+5=1645
Conclusion: Thus, the next number in the series is 1645

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?