78.36% is the change from 171 to 305
Calculation steps:
[( 305 - 171 ) ÷ 171] x 100 = 78.36%
Formula
Percentage change = [(305 - 171) / 171] x 100
Subtract the new number by the original number
305 - 171 = 134
134 ÷ 171 = 0.783625730994152
0.783625730994152 x 100 = 78.36%