-18.75% is the change from 800 to 650
Calculation steps:
[( 650 - 800 ) ÷ 800] x 100 = -18.75%
Formula
Percentage change = [(650 - 800) / 800] x 100
Subtract the new number by the original number
650 - 800 = -150
-150 ÷ 800 = -0.1875
-0.1875 x 100 = -18.75%