797.3% is the change from 74 to 664
Calculation steps:
[( 664 - 74 ) ÷ 74] x 100 = 797.3%
Formula
Percentage change = [(664 - 74) / 74] x 100
Subtract the new number by the original number
664 - 74 = 590
590 ÷ 74 = 7.972972972972973
7.972972972972973 x 100 = 797.3%