215.64% is the change from 211 to 666
Calculation steps:
[( 666 - 211 ) ÷ 211] x 100 = 215.64%
Formula
Percentage change = [(666 - 211) / 211] x 100
Subtract the new number by the original number
666 - 211 = 455
455 ÷ 211 = 2.156398104265403
2.156398104265403 x 100 = 215.64%