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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 cups cr…

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