710.13% is the change from 79 to 640
Calculation steps:
[( 640 - 79 ) ÷ 79] x 100 = 710.13%
Formula
Percentage change = [(640 - 79) / 79] x 100
Subtract the new number by the original number
640 - 79 = 561
561 ÷ 79 = 7.10126582278481
7.10126582278481 x 100 = 710.13%