Multiply 5.15 to 3.4
5.15 * 3.4 = 17.51
So the cost for all the ground beef is $17.51
We have a total of 5.15 pounds.
He makes 17 burgers out of this.
5.15 / 17 = 0.302941176
So he uses 0.302941176 pounds of beef per burger.
Multiply by 3.4:
0.302941176 * 3.4 = 1.03
So the cost of beef per purger is $1.03