702.5% is the change from 80 to 642
Calculation steps:
[( 642 - 80 ) ÷ 80] x 100 = 702.5%
Formula
Percentage change = [(642 - 80) / 80] x 100
Subtract the new number by the original number
642 - 80 = 562
562 ÷ 80 = 7.025
7.025 x 100 = 702.5%
Example