1420% is the change from 20 to 304
Calculation steps:
[( 304 - 20 ) ÷ 20] x 100 = 1420%
Formula
Percentage change = [(304 - 20) / 20] x 100
Subtract the new number by the original number
304 - 20 = 284
284 ÷ 20 = 14.2
14.2 x 100 = 1420%
Example