-71.5% is the change from 600 to 171
Calculation steps:
[( 171 - 600 ) ÷ 600] x 100 = -71.5%
Formula
Percentage change = [(171 - 600) / 600] x 100
Subtract the new number by the original number
171 - 600 = -429
-429 ÷ 600 = -0.715
-0.715 x 100 = -71.5%