-84.21% is the change from 171 to 27
Calculation steps:
[( 27 - 171 ) ÷ 171] x 100 = -84.21%
Formula
Percentage change = [(27 - 171) / 171] x 100
Subtract the new number by the original number
27 - 171 = -144
-144 ÷ 171 = -0.8421052631578947
-0.8421052631578947 x 100 = -84.21%