312.5% is the change from 120 to 495
Calculation steps:
[( 495 - 120 ) ÷ 120] x 100 = 312.5%
Formula
Percentage change = [(495 - 120) / 120] x 100
Subtract the new number by the original number
495 - 120 = 375
375 ÷ 120 = 3.125
3.125 x 100 = 312.5%
Example