-78.21% is the change from 780 to 170
Calculation steps:
[( 170 - 780 ) ÷ 780] x 100 = -78.21%
Formula
Percentage change = [(170 - 780) / 780] x 100
Subtract the new number by the original number
170 - 780 = -610
-610 ÷ 780 = -0.782051282051282
-0.782051282051282 x 100 = -78.21%