-32.81% is the change from 64 to 43
Calculation steps:
[( 43 - 64 ) ÷ 64] x 100 = -32.81%
Formula
Percentage change = [(43 - 64) / 64] x 100
Subtract the new number by the original number
43 - 64 = -21
-21 ÷ 64 = -0.328125
-0.328125 x 100 = -32.81%
Example