776.71% is the change from 73 to 640
Calculation steps:
[( 640 - 73 ) ÷ 73] x 100 = 776.71%
Formula
Percentage change = [(640 - 73) / 73] x 100
Subtract the new number by the original number
640 - 73 = 567
567 ÷ 73 = 7.767123287671233
7.767123287671233 x 100 = 776.71%