-71.18% is the change from 170 to 49
Calculation steps:
[( 49 - 170 ) ÷ 170] x 100 = -71.18%
Formula
Percentage change = [(49 - 170) / 170] x 100
Subtract the new number by the original number
49 - 170 = -121
-121 ÷ 170 = -0.711764705882353
-0.711764705882353 x 100 = -71.18%