-49.3% is the change from 1000 to 507
Calculation steps:
[( 507 - 1000 ) ÷ 1000] x 100 = -49.3%
Formula
Percentage change = [(507 - 1000) / 1000] x 100
Subtract the new number by the original number
507 - 1000 = -493
-493 ÷ 1000 = -0.493
-0.493 x 100 = -49.3%