297.4% is the change from 77 to 306
Calculation steps:
[( 306 - 77 ) ÷ 77] x 100 = 297.4%
Formula
Percentage change = [(306 - 77) / 77] x 100
Subtract the new number by the original number
306 - 77 = 229
229 ÷ 77 = 2.9740259740259742
2.9740259740259742 x 100 = 297.4%