1800% is the change from 20 to 380
Calculation steps:
[( 380 - 20 ) ÷ 20] x 100 = 1800%
Formula
Percentage change = [(380 - 20) / 20] x 100
Subtract the new number by the original number
380 - 20 = 360
360 ÷ 20 = 18
18 x 100 = 1800%
Example