Percentage Formulas

1.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% =46
Thus, 20% =47
To expressabybas a percent: We have,48
Thus,49= 25%.

2.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:
50
If the price of a commodity decreases by R%, then the increase in consumption so as not to decrease the expenditure is:
51

 

3.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 = P 52
2. Population n years ago = 53

4.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 = 54
2. Value of the machine n years ago = 55
3. If A is R% more than B, then B is less than A by 56
4. If A is R% less than B, then B is more than A by 57


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