-31.31% is the change from 840 to 577
Calculation steps:
[( 577 - 840 ) ÷ 840] x 100 = -31.31%
Formula
Percentage change = [(577 - 840) / 840] x 100
Subtract the new number by the original number
577 - 840 = -263
-263 ÷ 840 = -0.3130952380952381
-0.3130952380952381 x 100 = -31.31%