-2.38% is the change from 800 to 781
Calculation steps:
[( 781 - 800 ) ÷ 800] x 100 = -2.38%
Formula
Percentage change = [(781 - 800) / 800] x 100
Subtract the new number by the original number
781 - 800 = -19
-19 ÷ 800 = -0.02375
-0.02375 x 100 = -2.38%