7.83% is the change from 511 to 551
Calculation steps:
[( 551 - 511 ) ÷ 511] x 100 = 7.83%
Formula
Percentage change = [(551 - 511) / 511] x 100
Subtract the new number by the original number
551 - 511 = 40
40 ÷ 511 = 0.07827788649706457
0.07827788649706457 x 100 = 7.83%