245.31% is the change from 64 to 221
Calculation steps:
[( 221 - 64 ) ÷ 64] x 100 = 245.31%
Formula
Percentage change = [(221 - 64) / 64] x 100
Subtract the new number by the original number
221 - 64 = 157
157 ÷ 64 = 2.453125
2.453125 x 100 = 245.31%