2.45% is the change from 857 to 878
Calculation steps:
[( 878 - 857 ) ÷ 857] x 100 = 2.45%
Formula
Percentage change = [(878 - 857) / 857] x 100
Subtract the new number by the original number
878 - 857 = 21
21 ÷ 857 = 0.024504084014002333
0.024504084014002333 x 100 = 2.45%