-51.5% is the change from 1000 to 485
Calculation steps:
[( 485 - 1000 ) ÷ 1000] x 100 = -51.5%
Formula
Percentage change = [(485 - 1000) / 1000] x 100
Subtract the new number by the original number
485 - 1000 = -515
-515 ÷ 1000 = -0.515
-0.515 x 100 = -51.5%