Example 10
The price of a calculator increases from $20 to $25. Express this increase as a percentage of the original price.
Solution:
Problem Solving
Example 11
20% of a certain number is 75. Find the number.
Solution:
 So, the number is 375.
Example 12
A family spends 25 per cent of its income on mortgage repayments of $145 per week. Calculate the weekly income of the family.
Solution:
Let the family's weekly income be $x.
We are given that 25% of x is 145.
So, the family’s weekly income is $580.
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