1400% is the change from 20 to 300
Calculation steps:
[( 300 - 20 ) ÷ 20] x 100 = 1400%
Formula
Percentage change = [(300 - 20) / 20] x 100
Subtract the new number by the original number
300 - 20 = 280
280 ÷ 20 = 14
14 x 100 = 1400%
Example