784.93% is the change from 73 to 646
Calculation steps:
[( 646 - 73 ) ÷ 73] x 100 = 784.93%
Formula
Percentage change = [(646 - 73) / 73] x 100
Subtract the new number by the original number
646 - 73 = 573
573 ÷ 73 = 7.8493150684931505
7.8493150684931505 x 100 = 784.93%