-15.25% is the change from 800 to 678
Calculation steps:
[( 678 - 800 ) ÷ 800] x 100 = -15.25%
Formula
Percentage change = [(678 - 800) / 800] x 100
Subtract the new number by the original number
678 - 800 = -122
-122 ÷ 800 = -0.1525
-0.1525 x 100 = -15.25%