1303.33% is the change from 30 to 421
Calculation steps:
[( 421 - 30 ) ÷ 30] x 100 = 1303.33%
Formula
Percentage change = [(421 - 30) / 30] x 100
Subtract the new number by the original number
421 - 30 = 391
391 ÷ 30 = 13.033333333333333
13.033333333333333 x 100 = 1303.33%