Answer
The steak of the traditional market
Work Step by Step
To compare those steaks we need to now the cost at the same units, in this case we are going to take everything to gram:
12-oz steak:
$\frac{12oz}{$5.50}*\frac{1lbm}{16oz}*\frac{453.59g}{1lbm}=61.85\frac{g}{$}$
300-g steak:
$\frac{300g}{$5.20}=57.69\frac{g}{$}$
As you can see he receive more at the traditional market.