690.48% is the change from 84 to 664
Calculation steps:
[( 664 - 84 ) ÷ 84] x 100 = 690.48%
Formula
Percentage change = [(664 - 84) / 84] x 100
Subtract the new number by the original number
664 - 84 = 580
580 ÷ 84 = 6.904761904761905
6.904761904761905 x 100 = 690.48%