-82.81% is the change from 64 to 11
Calculation steps:
[( 11 - 64 ) ÷ 64] x 100 = -82.81%
Formula
Percentage change = [(11 - 64) / 64] x 100
Subtract the new number by the original number
11 - 64 = -53
-53 ÷ 64 = -0.828125
-0.828125 x 100 = -82.81%
Example