50.1% is the change from 509 to 764
Calculation steps:
[( 764 - 509 ) ÷ 509] x 100 = 50.1%
Formula
Percentage change = [(764 - 509) / 509] x 100
Subtract the new number by the original number
764 - 509 = 255
255 ÷ 509 = 0.5009823182711198
0.5009823182711198 x 100 = 50.1%