78.95% is the change from 171 to 306
Calculation steps:
[( 306 - 171 ) ÷ 171] x 100 = 78.95%
Formula
Percentage change = [(306 - 171) / 171] x 100
Subtract the new number by the original number
306 - 171 = 135
135 ÷ 171 = 0.7894736842105263
0.7894736842105263 x 100 = 78.95%