-10.94% is the change from 64 to 57
Calculation steps:
[( 57 - 64 ) ÷ 64] x 100 = -10.94%
Formula
Percentage change = [(57 - 64) / 64] x 100
Subtract the new number by the original number
57 - 64 = -7
-7 ÷ 64 = -0.109375
-0.109375 x 100 = -10.94%
Example