-20.85% is the change from 921 to 729
Calculation steps:
[( 729 - 921 ) ÷ 921] x 100 = -20.85%
Formula
Percentage change = [(729 - 921) / 921] x 100
Subtract the new number by the original number
729 - 921 = -192
-192 ÷ 921 = -0.20846905537459284
-0.20846905537459284 x 100 = -20.85%