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Suppose the the original price is :
[tex]x [/tex]
Thus ;
[tex]x - \frac{75}{100}x = 30 \\ [/tex]
[tex]x - \frac{3}{4} x = 30 \\ [/tex]
[tex] \frac{1}{4} x = 30 \\ [/tex] Multiply sides by 4
[tex]x = 120[/tex]
Thus the original price is 120 .
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