50.88% is the change from 509 to 768
Calculation steps:
[( 768 - 509 ) ÷ 509] x 100 = 50.88%
Formula
Percentage change = [(768 - 509) / 509] x 100
Subtract the new number by the original number
768 - 509 = 259
259 ÷ 509 = 0.5088408644400786
0.5088408644400786 x 100 = 50.88%