78.1% is the change from 306 to 545
Calculation steps:
[( 545 - 306 ) ÷ 306] x 100 = 78.1%
Formula
Percentage change = [(545 - 306) / 306] x 100
Subtract the new number by the original number
545 - 306 = 239
239 ÷ 306 = 0.7810457516339869
0.7810457516339869 x 100 = 78.1%