find the percent of increase 120 to 250

First, find the amount of increase by subtracting the original value (120) from the final value (250).

Then, divide that answer by the original value.

Turn this into a percent by multiplying by 100 and attaching a percent symbol.

250 - 120  =  130

130 ÷ 120  =  1.08333...

1.08333... x 100  =  108.33 %  (approximately)