-87.5% is the change from 64 to 8
Calculation steps:
[( 8 - 64 ) ÷ 64] x 100 = -87.5%
Formula
Percentage change = [(8 - 64) / 64] x 100
Subtract the new number by the original number
8 - 64 = -56
-56 ÷ 64 = -0.875
-0.875 x 100 = -87.5%
Example