-77.2% is the change from 750 to 171
Calculation steps:
[( 171 - 750 ) ÷ 750] x 100 = -77.2%
Formula
Percentage change = [(171 - 750) / 750] x 100
Subtract the new number by the original number
171 - 750 = -579
-579 ÷ 750 = -0.772
-0.772 x 100 = -77.2%