4062.5% is the change from 16 to 666
Calculation steps:
[( 666 - 16 ) ÷ 16] x 100 = 4062.5%
Formula
Percentage change = [(666 - 16) / 16] x 100
Subtract the new number by the original number
666 - 16 = 650
650 ÷ 16 = 40.625
40.625 x 100 = 4062.5%
Example