800% is the change from 74 to 666
Calculation steps:
[( 666 - 74 ) ÷ 74] x 100 = 800%
Formula
Percentage change = [(666 - 74) / 74] x 100
Subtract the new number by the original number
666 - 74 = 592
592 ÷ 74 = 8
8 x 100 = 800%
Example