A 3 lb bag of one brand of cat food costs $3.52. A 6 lb bag of another brand costs $6.80. Which brand is cheaper per pound?

For this case what we should do is find the price per pound of each of the brands of cat food.

We have then:

Mark 1:

3 lb costs $ 3.52

P = (3.52) / (3) = 1.17 $ / lb

Mark 2:

6 lb costs $ 6.80

P = (6.80) / (6) = 1.13 $ / lb

Answer:

Mark 2 is cheaper per pound:

1.13 $ / lb

A 6 lb bag of another brand