850% is the change from 20 to 190
Calculation steps:
[( 190 - 20 ) ÷ 20] x 100 = 850%
Formula
Percentage change = [(190 - 20) / 20] x 100
Subtract the new number by the original number
190 - 20 = 170
170 ÷ 20 = 8.5
8.5 x 100 = 850%
Example