-36% is the change from 100 to 64
Calculation steps:
[( 64 - 100 ) ÷ 100] x 100 = -36%
Formula
Percentage change = [(64 - 100) / 100] x 100
Subtract the new number by the original number
64 - 100 = -36
-36 ÷ 100 = -0.36
-0.36 x 100 = -36%
Example