3447.62% is the change from 21 to 745
Calculation steps:
[( 745 - 21 ) ÷ 21] x 100 = 3447.62%
Formula
Percentage change = [(745 - 21) / 21] x 100
Subtract the new number by the original number
745 - 21 = 724
724 ÷ 21 = 34.476190476190474
34.476190476190474 x 100 = 3447.62%