200% is the change from 220 to 660
Calculation steps:
[( 660 - 220 ) ÷ 220] x 100 = 200%
Formula
Percentage change = [(660 - 220) / 220] x 100
Subtract the new number by the original number
660 - 220 = 440
440 ÷ 220 = 2
2 x 100 = 200%
Example