-71.51% is the change from 172 to 49
Calculation steps:
[( 49 - 172 ) ÷ 172] x 100 = -71.51%
Formula
Percentage change = [(49 - 172) / 172] x 100
Subtract the new number by the original number
49 - 172 = -123
-123 ÷ 172 = -0.7151162790697675
-0.7151162790697675 x 100 = -71.51%