350% is the change from 120 to 540
Calculation steps:
[( 540 - 120 ) ÷ 120] x 100 = 350%
Formula
Percentage change = [(540 - 120) / 120] x 100
Subtract the new number by the original number
540 - 120 = 420
420 ÷ 120 = 3.5
3.5 x 100 = 350%
Example