-3.13% is the change from 64 to 62
Calculation steps:
[( 62 - 64 ) ÷ 64] x 100 = -3.13%
Formula
Percentage change = [(62 - 64) / 64] x 100
Subtract the new number by the original number
62 - 64 = -2
-2 ÷ 64 = -0.03125
-0.03125 x 100 = -3.13%
Example