79.53% is the change from 171 to 307
Calculation steps:
[( 307 - 171 ) ÷ 171] x 100 = 79.53%
Formula
Percentage change = [(307 - 171) / 171] x 100
Subtract the new number by the original number
307 - 171 = 136
136 ÷ 171 = 0.7953216374269005
0.7953216374269005 x 100 = 79.53%