77.91% is the change from 172 to 306
Calculation steps:
[( 306 - 172 ) ÷ 172] x 100 = 77.91%
Formula
Percentage change = [(306 - 172) / 172] x 100
Subtract the new number by the original number
306 - 172 = 134
134 ÷ 172 = 0.7790697674418605
0.7790697674418605 x 100 = 77.91%