-23.43% is the change from 845 to 647
Calculation steps:
[( 647 - 845 ) ÷ 845] x 100 = -23.43%
Formula
Percentage change = [(647 - 845) / 845] x 100
Subtract the new number by the original number
647 - 845 = -198
-198 ÷ 845 = -0.23431952662721894
-0.23431952662721894 x 100 = -23.43%