51.87% is the change from 509 to 773
Calculation steps:
[( 773 - 509 ) ÷ 509] x 100 = 51.87%
Formula
Percentage change = [(773 - 509) / 509] x 100
Subtract the new number by the original number
773 - 509 = 264
264 ÷ 509 = 0.518664047151277
0.518664047151277 x 100 = 51.87%