296.15% is the change from 78 to 309
Calculation steps:
[( 309 - 78 ) ÷ 78] x 100 = 296.15%
Formula
Percentage change = [(309 - 78) / 78] x 100
Subtract the new number by the original number
309 - 78 = 231
231 ÷ 78 = 2.9615384615384617
2.9615384615384617 x 100 = 296.15%