-42.3% is the change from 1000 to 577
Calculation steps:
[( 577 - 1000 ) ÷ 1000] x 100 = -42.3%
Formula
Percentage change = [(577 - 1000) / 1000] x 100
Subtract the new number by the original number
577 - 1000 = -423
-423 ÷ 1000 = -0.423
-0.423 x 100 = -42.3%