66.12% is the change from 307 to 510
Calculation steps:
[( 510 - 307 ) ÷ 307] x 100 = 66.12%
Formula
Percentage change = [(510 - 307) / 307] x 100
Subtract the new number by the original number
510 - 307 = 203
203 ÷ 307 = 0.6612377850162866
0.6612377850162866 x 100 = 66.12%