16.15% is the change from 551 to 640
Calculation steps:
[( 640 - 551 ) ÷ 551] x 100 = 16.15%
Formula
Percentage change = [(640 - 551) / 551] x 100
Subtract the new number by the original number
640 - 551 = 89
89 ÷ 551 = 0.16152450090744103
0.16152450090744103 x 100 = 16.15%