-19.19% is the change from 792 to 640
Calculation steps:
[( 640 - 792 ) ÷ 792] x 100 = -19.19%
Formula
Percentage change = [(640 - 792) / 792] x 100
Subtract the new number by the original number
640 - 792 = -152
-152 ÷ 792 = -0.1919191919191919
-0.1919191919191919 x 100 = -19.19%