-41.24% is the change from 291 to 171
Calculation steps:
[( 171 - 291 ) ÷ 291] x 100 = -41.24%
Formula
Percentage change = [(171 - 291) / 291] x 100
Subtract the new number by the original number
171 - 291 = -120
-120 ÷ 291 = -0.41237113402061853
-0.41237113402061853 x 100 = -41.24%