8.25% is the change from 509 to 551
Calculation steps:
[( 551 - 509 ) ÷ 509] x 100 = 8.25%
Formula
Percentage change = [(551 - 509) / 509] x 100
Subtract the new number by the original number
551 - 509 = 42
42 ÷ 509 = 0.0825147347740668
0.0825147347740668 x 100 = 8.25%