556.25% is the change from 64 to 420
Calculation steps:
[( 420 - 64 ) ÷ 64] x 100 = 556.25%
Formula
Percentage change = [(420 - 64) / 64] x 100
Subtract the new number by the original number
420 - 64 = 356
356 ÷ 64 = 5.5625
5.5625 x 100 = 556.25%
Example