-24.85% is the change from 849 to 638
Calculation steps:
[( 638 - 849 ) ÷ 849] x 100 = -24.85%
Formula
Percentage change = [(638 - 849) / 849] x 100
Subtract the new number by the original number
638 - 849 = -211
-211 ÷ 849 = -0.24852767962308597
-0.24852767962308597 x 100 = -24.85%