The marks of a student increased from 10 to 12 . Find the percentage increase in the marks.

A bus is moving at a speed of 82 km/hr. If its speed is reduced by 28%, then what will be the new speed of the bus (in km/hr)?

The random errors associated with the measurement of P and Q are 10% and 2%, respectively. What is the maximum percentage random error in P/Q?

When 85 percent of a number is added to 18, then the result is that number only. What is the value of the number?

27 percent of a number exceeds 13 percent of the same number by 56. What is the value of the number?

If the radius of a circle is decreased by 15%. By what percent area of the circle decrease?

​A number increased by 57% gives 942. Find the number.

The difference between the value of the number increased by 32% and the value of the number decreased by 28% is 180. Find the number.

If 22% of x is equal to 66% of y, then find the value of x : y.

X's income is 44% more than that of Y. What percent is Y's income less than X's?