1. Estimate the number of tickets sold daily in Bangalore. Calculate the total revenue for the entire month.
2. Given a string s and integer k, return the maximum number of vowel letters in any substring of s with length k. Vowel letters in English are 'a','e','i','o','u'.
3. What are profilers?
4. What is the relationship between chord, diameter, and radius in a circle?
5. What are the best practices to avoid re-renders and improve performance?