-45.7% is the change from 1000 to 543
Calculation steps:
[( 543 - 1000 ) ÷ 1000] x 100 = -45.7%
Formula
Percentage change = [(543 - 1000) / 1000] x 100
Subtract the new number by the original number
543 - 1000 = -457
-457 ÷ 1000 = -0.457
-0.457 x 100 = -45.7%