-79.3% is the change from 768 to 159
Calculation steps:
[( 159 - 768 ) ÷ 768] x 100 = -79.3%
Formula
Percentage change = [(159 - 768) / 768] x 100
Subtract the new number by the original number
159 - 768 = -609
-609 ÷ 768 = -0.79296875
-0.79296875 x 100 = -79.3%