2.68% is the change from 857 to 880
Calculation steps:
[( 880 - 857 ) ÷ 857] x 100 = 2.68%
Formula
Percentage change = [(880 - 857) / 857] x 100
Subtract the new number by the original number
880 - 857 = 23
23 ÷ 857 = 0.026837806301050177
0.026837806301050177 x 100 = 2.68%