809.52% is the change from 21 to 191
Calculation steps:
[( 191 - 21 ) ÷ 21] x 100 = 809.52%
Formula
Percentage change = [(191 - 21) / 21] x 100
Subtract the new number by the original number
191 - 21 = 170
170 ÷ 21 = 8.095238095238095
8.095238095238095 x 100 = 809.52%