-66.75% is the change from 800 to 266
Calculation steps:
[( 266 - 800 ) ÷ 800] x 100 = -66.75%
Formula
Percentage change = [(266 - 800) / 800] x 100
Subtract the new number by the original number
266 - 800 = -534
-534 ÷ 800 = -0.6675
-0.6675 x 100 = -66.75%