1350% is the change from 20 to 290
Calculation steps:
[( 290 - 20 ) ÷ 20] x 100 = 1350%
Formula
Percentage change = [(290 - 20) / 20] x 100
Subtract the new number by the original number
290 - 20 = 270
270 ÷ 20 = 13.5
13.5 x 100 = 1350%
Example