Life Mathematics

- To express
*x*as a percentage of*y,*percentage = *x*% of a given quantity =- If
*x*% of a given quantity is*y*, then quantity =

**Example:** In a bag there are 6 blue marbles, 4 red marbles and 5 green marbles. What percent of total marbles are blue?

**Solution: **Total number of marbles = 6 + 4 + 5 = 15

Number of blue marbles = 6

∴ Percentage of blue marbles =

- Formula for percentage increase and decrease are:

**Example:** In the year 2007, the number of children in a locality was 1500. In the year 2008, the number of children in the locality rose to 2100. Find the percent increase in the number of children of the locality.

**Solution: **

Increase in the number of children = 2100 – 1500 = 600

Percent increase

Thus, the required percent increase in the number of children of the locality is 40%.

- The formulae to calculate profit and loss are:
- Profit %
- Loss %

**Example:**

A shopkeeper purchased 15 dozen cups for Rs 900. However, 9 cup…

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