523.44% is the change from 64 to 399
Calculation steps:
[( 399 - 64 ) ÷ 64] x 100 = 523.44%
Formula
Percentage change = [(399 - 64) / 64] x 100
Subtract the new number by the original number
399 - 64 = 335
335 ÷ 64 = 5.234375
5.234375 x 100 = 523.44%