821.21% is the change from 66 to 608
Calculation steps:
[( 608 - 66 ) ÷ 66] x 100 = 821.21%
Formula
Percentage change = [(608 - 66) / 66] x 100
Subtract the new number by the original number
608 - 66 = 542
542 ÷ 66 = 8.212121212121213
8.212121212121213 x 100 = 821.21%