1250% is the change from 20 to 270
Calculation steps:
[( 270 - 20 ) ÷ 20] x 100 = 1250%
Formula
Percentage change = [(270 - 20) / 20] x 100
Subtract the new number by the original number
270 - 20 = 250
250 ÷ 20 = 12.5
12.5 x 100 = 1250%
Example