Part C - Elementary Mathematics
The simple interest on a certain sum of money at rate of interest 6% per annum for 2 years is ₹960. What is the compound interest (compounding annually) on the same sum for the same period and at the same rate of interest?
The average age of 30 students in a class is 20 years. If each student's age is increased by 5 years, then determine the number by which the average age is increased.
W and X together can complete a work in 40 days. X and Y together can complete the same work in 60 days. If W, X and Y all work together, then the same work gets completed in 30 days. How many days will W and Y together take to complete the same work?