125% is the change from 420 to 945
Calculation steps:
[( 945 - 420 ) ÷ 420] x 100 = 125%
Formula
Percentage change = [(945 - 420) / 420] x 100
Subtract the new number by the original number
945 - 420 = 525
525 ÷ 420 = 1.25
1.25 x 100 = 125%
Example