79.15% is the change from 307 to 550
Calculation steps:
[( 550 - 307 ) ÷ 307] x 100 = 79.15%
Formula
Percentage change = [(550 - 307) / 307] x 100
Subtract the new number by the original number
550 - 307 = 243
243 ÷ 307 = 0.7915309446254072
0.7915309446254072 x 100 = 79.15%