330.3% is the change from 66 to 284
Calculation steps:
[( 284 - 66 ) ÷ 66] x 100 = 330.3%
Formula
Percentage change = [(284 - 66) / 66] x 100
Subtract the new number by the original number
284 - 66 = 218
218 ÷ 66 = 3.303030303030303
3.303030303030303 x 100 = 330.3%