-80% is the change from 870 to 174
Calculation steps:
[( 174 - 870 ) ÷ 870] x 100 = -80%
Formula
Percentage change = [(174 - 870) / 870] x 100
Subtract the new number by the original number
174 - 870 = -696
-696 ÷ 870 = -0.8
-0.8 x 100 = -80%
Example