-61% is the change from 1000 to 390
Calculation steps:
[( 390 - 1000 ) ÷ 1000] x 100 = -61%
Formula
Percentage change = [(390 - 1000) / 1000] x 100
Subtract the new number by the original number
390 - 1000 = -610
-610 ÷ 1000 = -0.61
-0.61 x 100 = -61%