301.56% is the change from 64 to 257
Calculation steps:
[( 257 - 64 ) ÷ 64] x 100 = 301.56%
Formula
Percentage change = [(257 - 64) / 64] x 100
Subtract the new number by the original number
257 - 64 = 193
193 ÷ 64 = 3.015625
3.015625 x 100 = 301.56%