31.87% is the change from 637 to 840
Calculation steps:
[( 840 - 637 ) ÷ 637] x 100 = 31.87%
Formula
Percentage change = [(840 - 637) / 637] x 100
Subtract the new number by the original number
840 - 637 = 203
203 ÷ 637 = 0.31868131868131866
0.31868131868131866 x 100 = 31.87%