79.74% is the change from 306 to 550
Calculation steps:
[( 550 - 306 ) ÷ 306] x 100 = 79.74%
Formula
Percentage change = [(550 - 306) / 306] x 100
Subtract the new number by the original number
550 - 306 = 244
244 ÷ 306 = 0.7973856209150327
0.7973856209150327 x 100 = 79.74%