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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