310.61% is the change from 66 to 271
Calculation steps:
[( 271 - 66 ) ÷ 66] x 100 = 310.61%
Formula
Percentage change = [(271 - 66) / 66] x 100
Subtract the new number by the original number
271 - 66 = 205
205 ÷ 66 = 3.106060606060606
3.106060606060606 x 100 = 310.61%