-78% is the change from 1000 to 220
Calculation steps:
[( 220 - 1000 ) ÷ 1000] x 100 = -78%
Formula
Percentage change = [(220 - 1000) / 1000] x 100
Subtract the new number by the original number
220 - 1000 = -780
-780 ÷ 1000 = -0.78
-0.78 x 100 = -78%