-77.73% is the change from 768 to 171
Calculation steps:
[( 171 - 768 ) ÷ 768] x 100 = -77.73%
Formula
Percentage change = [(171 - 768) / 768] x 100
Subtract the new number by the original number
171 - 768 = -597
-597 ÷ 768 = -0.77734375
-0.77734375 x 100 = -77.73%