39.75% is the change from 551 to 770
Calculation steps:
[( 770 - 551 ) ÷ 551] x 100 = 39.75%
Formula
Percentage change = [(770 - 551) / 551] x 100
Subtract the new number by the original number
770 - 551 = 219
219 ÷ 551 = 0.397459165154265
0.397459165154265 x 100 = 39.75%