An object has a mass of 11 kg and is placed at a height above the ground. If its potential energy is 440 J and g = 10 m/s2, what is the height?

An institution has 5 classes containing 50, 60, 25, 40, and 70 students. The pass percentages of these 5 classes are 20%, 25%, 20%, 10%, and 30% respectively. Find the average number of passed students per class in the institution.

If the Consumer Price Index (CPI) increases from 125 in 1995 to 140 in 1996, what is the annual rate of inflation?