R82.99 per kg
Most burgers are produced on a least-cost basis. Least cost means you can sell it for less than the opposition, capture more market and make more money. Forget quality, use cheap meat, as much fat as you can get away with and as much filler material as you can to lower the cost even more.
The perfect burger is made from beef brisket. It has a great texture, the right mixture of lean and fat (you want some fat to add to the flavour, just not too much) and the flavour of brisket is probably the best of any joint on a bullock.