Answer: 25%
Step-by-step explanation:
The percent decrease is given by :-
[tex]\dfrac{\text{Decrease in amount}}{\text{Previous amount}}\times 100[/tex]
Given : A store decreases the price of an item from $120 to $90 .
Decrease in amount = [tex]\$120-\$90=\$30[/tex]
The percent decrease will be :_
[tex]\dfrac{30}{120}\times 100=25\%[/tex]
Hence, the percent decreases = 25%.