677.78% is the change from 81 to 630
Calculation steps:
[( 630 - 81 ) ÷ 81] x 100 = 677.78%
Formula
Percentage change = [(630 - 81) / 81] x 100
Subtract the new number by the original number
630 - 81 = 549
549 ÷ 81 = 6.777777777777778
6.777777777777778 x 100 = 677.78%