-49.71% is the change from 342 to 172
Calculation steps:
[( 172 - 342 ) ÷ 342] x 100 = -49.71%
Formula
Percentage change = [(172 - 342) / 342] x 100
Subtract the new number by the original number
172 - 342 = -170
-170 ÷ 342 = -0.49707602339181284
-0.49707602339181284 x 100 = -49.71%