800% is the change from 19 to 171
Calculation steps:
[( 171 - 19 ) ÷ 19] x 100 = 800%
Formula
Percentage change = [(171 - 19) / 19] x 100
Subtract the new number by the original number
171 - 19 = 152
152 ÷ 19 = 8
8 x 100 = 800%
Example