49% is the change from 551 to 821
Calculation steps:
[( 821 - 551 ) ÷ 551] x 100 = 49%
Formula
Percentage change = [(821 - 551) / 551] x 100
Subtract the new number by the original number
821 - 551 = 270
270 ÷ 551 = 0.4900181488203267
0.4900181488203267 x 100 = 49%