678.05% is the change from 82 to 638
Calculation steps:
[( 638 - 82 ) ÷ 82] x 100 = 678.05%
Formula
Percentage change = [(638 - 82) / 82] x 100
Subtract the new number by the original number
638 - 82 = 556
556 ÷ 82 = 6.780487804878049
6.780487804878049 x 100 = 678.05%