By using basic meaning of percentage we get final price as 0.8x .
Percentage is a number or ratio expressed as a fraction of 100.
Given that original price is = x
And discount is 20%
Which means off of RS 20 on RS 100
So we can say that off on RS 1 = RS 20/100
So off on RS 1 = RS 1/5
Hence off on RS x = x/5
Now we can calculate final price as
original price - off
[tex]x- \frac{x}{5}[/tex]
Taking LCM
[tex]\frac{5x-x}{5}\\\\\frac {4x}{5}[/tex]
[tex]0.8x[/tex]
By using basic meaning of percentage we get final price as 0.8x .
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