-62.35% is the change from 170 to 64
Calculation steps:
[( 64 - 170 ) ÷ 170] x 100 = -62.35%
Formula
Percentage change = [(64 - 170) / 170] x 100
Subtract the new number by the original number
64 - 170 = -106
-106 ÷ 170 = -0.6235294117647059
-0.6235294117647059 x 100 = -62.35%