-17.25% is the change from 800 to 662
Calculation steps:
[( 662 - 800 ) ÷ 800] x 100 = -17.25%
Formula
Percentage change = [(662 - 800) / 800] x 100
Subtract the new number by the original number
662 - 800 = -138
-138 ÷ 800 = -0.1725
-0.1725 x 100 = -17.25%