700% is the change from 64 to 512
Calculation steps:
[( 512 - 64 ) ÷ 64] x 100 = 700%
Formula
Percentage change = [(512 - 64) / 64] x 100
Subtract the new number by the original number
512 - 64 = 448
448 ÷ 64 = 7
7 x 100 = 700%
Example