2300% is the change from 30 to 720
Calculation steps:
[( 720 - 30 ) ÷ 30] x 100 = 2300%
Formula
Percentage change = [(720 - 30) / 30] x 100
Subtract the new number by the original number
720 - 30 = 690
690 ÷ 30 = 23
23 x 100 = 2300%
Example