Answer :
The sale price of the shirt is $162.5
What is a percentage?
A percentage is a number or ratio that can be expressed in the form of a fraction by 100. The percentage of a number is defined as the value of the number out of 100. Percentage does not have any unit of measurement.
If the regular price is $30 and the sale is 45%,it means the $30 represents the other 55% of the sale price. So it can be written as
sale price= 55%×regular price
Here sale price is taken as s
s= 55%×$30
Solving this for s, we get
s= (55/100)×$30
s=0.55×$30
s=$16.5
So, the sale price is $16.5
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