77.17% is the change from 311 to 551
Calculation steps:
[( 551 - 311 ) ÷ 311] x 100 = 77.17%
Formula
Percentage change = [(551 - 311) / 311] x 100
Subtract the new number by the original number
551 - 311 = 240
240 ÷ 311 = 0.7717041800643086
0.7717041800643086 x 100 = 77.17%