-79.35% is the change from 770 to 159
Calculation steps:
[( 159 - 770 ) ÷ 770] x 100 = -79.35%
Formula
Percentage change = [(159 - 770) / 770] x 100
Subtract the new number by the original number
159 - 770 = -611
-611 ÷ 770 = -0.7935064935064935
-0.7935064935064935 x 100 = -79.35%