-58% is the change from 1000 to 420
Calculation steps:
[( 420 - 1000 ) ÷ 1000] x 100 = -58%
Formula
Percentage change = [(420 - 1000) / 1000] x 100
Subtract the new number by the original number
420 - 1000 = -580
-580 ÷ 1000 = -0.58
-0.58 x 100 = -58%