*Concept of Percentage:*By a certain*percent*, we mean that many hundredths.Thus,*x*percent means*x*hundredths, written as*x*%.

To express *x*% as a fraction: We have,*x*% =*x*. 100 Thus, 20% = 20 = 1 . 100 5 To express *a*as a percent: We have, *a*= *a*x 100 %. *b**b**b*Thus, 1 = 1 x 100 % = 25%. 4 4 *Percentage Increase/Decrease:*If the price of a commodity increases by R%, then the reduction in consumption so as not to increase the expenditure is:

R x 100 % (100 + R) If the price of a commodity decreases by R%, then the increase in consumption so as not to decrease the expenditure is:

R x 100 % (100 – R) *Results on Population:*Let the population of a town be P now and suppose it increases at the rate of R% per annum, then:

1. Population after *n*years = P1 + R n 100 2. Population *n*years ago =P 1 + R n 100 *Results on Depreciation:*Let the present value of a machine be P. Suppose it depreciates at the rate of R% per annum. Then:

1. Value of the machine after *n*years = P1 – R n 100 2. Value of the machine *n*years ago =P 1 – R n 100 3. If A is R% more than B, then B is less than A by R x 100 %. (100 + R) 4. If A is R% less than B, then B is more than A by R x 100 %. (100 – R) #### A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had:

Correct! Wrong!#### What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?

Correct! Wrong!#### If A = x% of y and B = y% of x, then which of the following is true?

Correct! Wrong!#### If 20% of a = b, then b% of 20 is the same as:

Correct! Wrong!#### Two numbers A and B are such that the sum of 5% of A and 4% of B is two-third of the sum of 6% of A and 8% of B. Find the ratio of A : B.

Correct! Wrong!QUIZ ON PERCENTAGE RELATED PROBLEMSGREAT JOB!!!!Share your Results: