-79% is the change from 1000 to 210
Calculation steps:
[( 210 - 1000 ) ÷ 1000] x 100 = -79%
Formula
Percentage change = [(210 - 1000) / 1000] x 100
Subtract the new number by the original number
210 - 1000 = -790
-790 ÷ 1000 = -0.79
-0.79 x 100 = -79%