51.47% is the change from 509 to 771
Calculation steps:
[( 771 - 509 ) ÷ 509] x 100 = 51.47%
Formula
Percentage change = [(771 - 509) / 509] x 100
Subtract the new number by the original number
771 - 509 = 262
262 ÷ 509 = 0.5147347740667977
0.5147347740667977 x 100 = 51.47%