203.33% is the change from 30 to 91
Calculation steps:
[( 91 - 30 ) ÷ 30] x 100 = 203.33%
Formula
Percentage change = [(91 - 30) / 30] x 100
Subtract the new number by the original number
91 - 30 = 61
61 ÷ 30 = 2.033333333333333
2.033333333333333 x 100 = 203.33%