-15.38% is the change from 800 to 677
Calculation steps:
[( 677 - 800 ) ÷ 800] x 100 = -15.38%
Formula
Percentage change = [(677 - 800) / 800] x 100
Subtract the new number by the original number
677 - 800 = -123
-123 ÷ 800 = -0.15375
-0.15375 x 100 = -15.38%