-10.21% is the change from 891 to 800
Calculation steps:
[( 800 - 891 ) ÷ 891] x 100 = -10.21%
Formula
Percentage change = [(800 - 891) / 891] x 100
Subtract the new number by the original number
800 - 891 = -91
-91 ÷ 891 = -0.10213243546576879
-0.10213243546576879 x 100 = -10.21%