-27.95% is the change from 891 to 642
Calculation steps:
[( 642 - 891 ) ÷ 891] x 100 = -27.95%
Formula
Percentage change = [(642 - 891) / 891] x 100
Subtract the new number by the original number
642 - 891 = -249
-249 ÷ 891 = -0.27946127946127947
-0.27946127946127947 x 100 = -27.95%