303% is the change from 100 to 403
Calculation steps:
[( 403 - 100 ) ÷ 100] x 100 = 303%
Formula
Percentage change = [(403 - 100) / 100] x 100
Subtract the new number by the original number
403 - 100 = 303
303 ÷ 100 = 3.03
3.03 x 100 = 303%
Example