3400% is the change from 21 to 735
Calculation steps:
[( 735 - 21 ) ÷ 21] x 100 = 3400%
Formula
Percentage change = [(735 - 21) / 21] x 100
Subtract the new number by the original number
735 - 21 = 714
714 ÷ 21 = 34
34 x 100 = 3400%
Example