The month starts on Tuesday.
The month has 30 days.
Every 7 days is a week, meaning 4 full weeks = 28 days.
The 29th day falls on Tuesday - 1 day = Monday.
The 30th day falls on Tuesday + 1 day = Wednesday.
Conclusion: Thus, the last day of the month falls on Wednesday (Option D)
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?