703.75% is the change from 80 to 643
Calculation steps:
[( 643 - 80 ) ÷ 80] x 100 = 703.75%
Formula
Percentage change = [(643 - 80) / 80] x 100
Subtract the new number by the original number
643 - 80 = 563
563 ÷ 80 = 7.0375
7.0375 x 100 = 703.75%
Example