234.85% is the change from 66 to 221
Calculation steps:
[( 221 - 66 ) ÷ 66] x 100 = 234.85%
Formula
Percentage change = [(221 - 66) / 66] x 100
Subtract the new number by the original number
221 - 66 = 155
155 ÷ 66 = 2.3484848484848486
2.3484848484848486 x 100 = 234.85%