Suppose the original quantity is 75 and the new quantity is 135 what should be the first step in solving for the percent increase? what is the percent increase? plz

Percentage increase = final value-initial value / initial value  * 100
 = 135 - 75 / 75  * 100
 = 60 / 3  * 4
 = 240/3
 = 80%

In short, Your Answer would be 80%

Hope this helps!