-90.63% is the change from 64 to 6
Calculation steps:
[( 6 - 64 ) ÷ 64] x 100 = -90.63%
Formula
Percentage change = [(6 - 64) / 64] x 100
Subtract the new number by the original number
6 - 64 = -58
-58 ÷ 64 = -0.90625
-0.90625 x 100 = -90.63%
Example