489.39% is the change from 66 to 389
Calculation steps:
[( 389 - 66 ) ÷ 66] x 100 = 489.39%
Formula
Percentage change = [(389 - 66) / 66] x 100
Subtract the new number by the original number
389 - 66 = 323
323 ÷ 66 = 4.893939393939394
4.893939393939394 x 100 = 489.39%