63.84% is the change from 307 to 503
Calculation steps:
[( 503 - 307 ) ÷ 307] x 100 = 63.84%
Formula
Percentage change = [(503 - 307) / 307] x 100
Subtract the new number by the original number
503 - 307 = 196
196 ÷ 307 = 0.6384364820846905
0.6384364820846905 x 100 = 63.84%