Step 1: The correct structure after “don’t hesitate” is “to + verb,” as it is an infinitive form.
Step 2: “Ask a question” is incorrect because it lacks the infinitive “to.”
Step 3: “To asking a question” is incorrect because “asking” is a gerund, not an infinitive.
Thus, the correct answer is: “to ask a question.”
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?