16550% is the change from 4 to 666
Calculation steps:
[( 666 - 4 ) ÷ 4] x 100 = 16550%
Formula
Percentage change = [(666 - 4) / 4] x 100
Subtract the new number by the original number
666 - 4 = 662
662 ÷ 4 = 165.5
165.5 x 100 = 16550%
Example