33.07% is the change from 644 to 857
Calculation steps:
[( 857 - 644 ) ÷ 644] x 100 = 33.07%
Formula
Percentage change = [(857 - 644) / 644] x 100
Subtract the new number by the original number
857 - 644 = 213
213 ÷ 644 = 0.3307453416149068
0.3307453416149068 x 100 = 33.07%