-21.95% is the change from 82 to 64
Calculation steps:
[( 64 - 82 ) ÷ 82] x 100 = -21.95%
Formula
Percentage change = [(64 - 82) / 82] x 100
Subtract the new number by the original number
64 - 82 = -18
-18 ÷ 82 = -0.21951219512195122
-0.21951219512195122 x 100 = -21.95%