-43.75% is the change from 64 to 36
Calculation steps:
[( 36 - 64 ) ÷ 64] x 100 = -43.75%
Formula
Percentage change = [(36 - 64) / 64] x 100
Subtract the new number by the original number
36 - 64 = -28
-28 ÷ 64 = -0.4375
-0.4375 x 100 = -43.75%
Example