3438.1% is the change from 21 to 743
Calculation steps:
[( 743 - 21 ) ÷ 21] x 100 = 3438.1%
Formula
Percentage change = [(743 - 21) / 21] x 100
Subtract the new number by the original number
743 - 21 = 722
722 ÷ 21 = 34.38095238095238
34.38095238095238 x 100 = 3438.1%