Percent change formula states that
((New-old)/old) x 100 = the percent change / percent increase
So if we take your equation and plug it into our formula
((225-120)/120) x 100
(105)/120 x 100
.875 x 100
87.5 % increase of students on the trip
Hope this helps!
12 is 1 more than 11
12 is one less than 13
this ok?
The answer is 25z if you need to know how i can show you