Changes in quantities are often expressed as a percentage of the original quantity.
There are two different methods which can be used to solve percentage increase or decrease problems.
Method : Finding Percentage Increase or Decrease with two steps :
Step 1 : Find the size of the increase or decrease.
Step 2 : Apply the change to the original quantity by addition or subtraction.
Example 1 : A fruit grower picked 1720 kg of apples last year. This year she expects her crop to be 20% bigger. How many kilograms of apples does she expect to pick this year ?
Step 1 : Size of increase = 20% of 1720 kg = 0.2 1720 kg = 344 kg
Step 2 : New amount = 1720 + 344 kg = 2064 kg
The fruit grower expects to pick 2064 kg.
2.5 % increase in a salary of $ 1250 is ___________________ | |||
Right Option : C | |||
View Explanation |
The salary of a person goes up from Rs 100 to Rs 145. The percentage increase in his salary is ___________________ . | |||
Right Option : A | |||
View Explanation |
Over the past 10 years, the population of a town has increased by 25% The population of the town 10 years ago was 18000 What is the population of the town now? | |||
Right Option : A | |||
View Explanation |
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