-77.92% is the change from 770 to 170
Calculation steps:
[( 170 - 770 ) ÷ 770] x 100 = -77.92%
Formula
Percentage change = [(170 - 770) / 770] x 100
Subtract the new number by the original number
170 - 770 = -600
-600 ÷ 770 = -0.7792207792207793
-0.7792207792207793 x 100 = -77.92%