-21% is the change from 800 to 632
Calculation steps:
[( 632 - 800 ) ÷ 800] x 100 = -21%
Formula
Percentage change = [(632 - 800) / 800] x 100
Subtract the new number by the original number
632 - 800 = -168
-168 ÷ 800 = -0.21
-0.21 x 100 = -21%
Example