206.91% is the change from 217 to 666
Calculation steps:
[( 666 - 217 ) ÷ 217] x 100 = 206.91%
Formula
Percentage change = [(666 - 217) / 217] x 100
Subtract the new number by the original number
666 - 217 = 449
449 ÷ 217 = 2.0691244239631335
2.0691244239631335 x 100 = 206.91%