1230% is the change from 20 to 266
Calculation steps:
[( 266 - 20 ) ÷ 20] x 100 = 1230%
Formula
Percentage change = [(266 - 20) / 20] x 100
Subtract the new number by the original number
266 - 20 = 246
246 ÷ 20 = 12.3
12.3 x 100 = 1230%
Example