-19.91% is the change from 849 to 680
Calculation steps:
[( 680 - 849 ) ÷ 849] x 100 = -19.91%
Formula
Percentage change = [(680 - 849) / 849] x 100
Subtract the new number by the original number
680 - 849 = -169
-169 ÷ 849 = -0.19905771495877503
-0.19905771495877503 x 100 = -19.91%