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.
An adult ticket for the cinema costs $13.40 . A child ticket is half the price of an adult ticket. Mr and Mrs Becter and their six children go to see a movie. Mrs Becter has a voucher for 18% off. Work out how much Mrs Becter pays for the tickets. | |||
Right Option : A | |||
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2.5 % increase in a salary of $ 1250 is ___________________ | |||
Right Option : C | |||
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Last year, there was 20 students in a class. This year, there are 30% more students. How many students are in the class this year? | |||
Right Option : D | |||
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