49.9% is the change from 511 to 766
Calculation steps:
[( 766 - 511 ) ÷ 511] x 100 = 49.9%
Formula
Percentage change = [(766 - 511) / 511] x 100
Subtract the new number by the original number
766 - 511 = 255
255 ÷ 511 = 0.49902152641878667
0.49902152641878667 x 100 = 49.9%