30% is the change from 310 to 403
Calculation steps:
[( 403 - 310 ) ÷ 310] x 100 = 30%
Formula
Percentage change = [(403 - 310) / 310] x 100
Subtract the new number by the original number
403 - 310 = 93
93 ÷ 310 = 0.3
0.3 x 100 = 30%
Example