Part C - Elementary Mathematics
The simple interest on a certain sum of money at rate of interest 6% per annum for 2 years is Rs. 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?