To express one quantity as a percentage
of another, make sure that both
quantities are expressed in the same units. Write the given quantity
as a fraction of the total and multiply it by 100%. Then simplify.
Example 8
I obtained 40 marks out of 60 in a test. Convert this test mark to
a percentage. Round your answer to the nearest per cent.
Solution:
So, the percentage test mark is 67%.
Note:
Write 40 as a fraction of 60. Then multiply it by 100%.
Example 9
What percentage of $5 is 42¢?
Solution:
Note:
To express one quantity as a percentage of another, we must have both
quantities in the same units.
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