-20.5% is the change from 844 to 671
Calculation steps:
[( 671 - 844 ) ÷ 844] x 100 = -20.5%
Formula
Percentage change = [(671 - 844) / 844] x 100
Subtract the new number by the original number
671 - 844 = -173
-173 ÷ 844 = -0.20497630331753555
-0.20497630331753555 x 100 = -20.5%