3.13% is the change from 64 to 66
Calculation steps:
[( 66 - 64 ) ÷ 64] x 100 = 3.13%
Formula
Percentage change = [(66 - 64) / 64] x 100
Subtract the new number by the original number
66 - 64 = 2
2 ÷ 64 = 0.03125
0.03125 x 100 = 3.13%
Example