819.75% is the change from 81 to 745
Calculation steps:
[( 745 - 81 ) ÷ 81] x 100 = 819.75%
Formula
Percentage change = [(745 - 81) / 81] x 100
Subtract the new number by the original number
745 - 81 = 664
664 ÷ 81 = 8.197530864197532
8.197530864197532 x 100 = 819.75%