-78.3% is the change from 788 to 171
Calculation steps:
[( 171 - 788 ) ÷ 788] x 100 = -78.3%
Formula
Percentage change = [(171 - 788) / 788] x 100
Subtract the new number by the original number
171 - 788 = -617
-617 ÷ 788 = -0.7829949238578681
-0.7829949238578681 x 100 = -78.3%