834.85% is the change from 66 to 617
Calculation steps:
[( 617 - 66 ) ÷ 66] x 100 = 834.85%
Formula
Percentage change = [(617 - 66) / 66] x 100
Subtract the new number by the original number
617 - 66 = 551
551 ÷ 66 = 8.348484848484848
8.348484848484848 x 100 = 834.85%