77.21% is the change from 509 to 902
Calculation steps:
[( 902 - 509 ) ÷ 509] x 100 = 77.21%
Formula
Percentage change = [(902 - 509) / 509] x 100
Subtract the new number by the original number
902 - 509 = 393
393 ÷ 509 = 0.7721021611001965
0.7721021611001965 x 100 = 77.21%