940.63% is the change from 64 to 666
Calculation steps:
[( 666 - 64 ) ÷ 64] x 100 = 940.63%
Formula
Percentage change = [(666 - 64) / 64] x 100
Subtract the new number by the original number
666 - 64 = 602
602 ÷ 64 = 9.40625
9.40625 x 100 = 940.63%
Example