-21.55% is the change from 826 to 648
Calculation steps:
[( 648 - 826 ) ÷ 826] x 100 = -21.55%
Formula
Percentage change = [(648 - 826) / 826] x 100
Subtract the new number by the original number
648 - 826 = -178
-178 ÷ 826 = -0.21549636803874092
-0.21549636803874092 x 100 = -21.55%