Formulae
1. Express x% as a fraction = x% =x/100
2. To express a/b as a percent = a/b = (a/b*100)%.
3. If the price increases by R%, then the reduction in consumption so as not to increase the expenditure is - [R/(100+R)x 100]%
4. If the price decreases by R%, then the increase in consumption so as not to decrease the expenditure is - [R/(100-R)x 100]%
5. Population after n years = P(1 + R/100)^n
6. Population n years ago = P/(1 + R/100)^n
7. The Value of machine after n years = P(1 - R/100)^n
8. Value of the machine n years ago = P/(1 - R/100)^n
9. If A is R% more than B, then B is less than A by [R/(100+R)* 100]%.
10. If A is R% less than B, then B is more than A by [R/(100-R)* 100]%
Exercise : Percentage MCQ Questions and Answers
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