321.88% is the change from 64 to 270
Calculation steps:
[( 270 - 64 ) ÷ 64] x 100 = 321.88%
Formula
Percentage change = [(270 - 64) / 64] x 100
Subtract the new number by the original number
270 - 64 = 206
206 ÷ 64 = 3.21875
3.21875 x 100 = 321.88%
Example