The number of illiterate persons in a country decreased from 150 lakhs to 100 lakhs in 10 years. What is the percentage of decrease?

The population of a city decreased from 25,000 to 24,500. Find the percentage decrease.

The kinetic enregy of a body decreases by 19% .What is the percentage decrease in mementum?

The number of government companies have decreased over the year 1998 to 2012.

In a first order reaction, the concentration of the reactant decreases from 800 mol/ dm^3 to 50 mol/ dm^3 in 2 xx 10^4 sec. The rate constant of the reaction in sec^-1 is

Find Percentage of increase or decrease: Marks in a test incresed from 20 to 30.

The count rate from a radiuactive sample falls from 4.0 xx 10^6 s^(-1) to 1.0 xx 10^6 s^(-1) in 20 hours.What will be the count rate 100 hours after the beginning.

Of the students in a college, it is known that 60% reside in hostel and 40% are day-scholars (not residing in hostel). Previous year results report that 30% of all students who reside in hostel attain A grade and 20% of day-scholars attain A grade in their annual examination. At the end of the year, one student is chosen at random from the college and he has an A grade. What is the probability that the student is a hostlier ?

The income of a person is ₹ 3,00,000 in the first year and receives an increase of % 10,000 to his income per year for the next 19 years. Find the total amount, he receives in 20 years.