306.25% is the change from 64 to 260
Calculation steps:
[( 260 - 64 ) ÷ 64] x 100 = 306.25%
Formula
Percentage change = [(260 - 64) / 64] x 100
Subtract the new number by the original number
260 - 64 = 196
196 ÷ 64 = 3.0625
3.0625 x 100 = 306.25%
Example