An online retailer sells two packages of protein bars.

Package

10-pack of 2.1 ounce bars

12-pack of 1.4 ounce bars

Cost ($)

15.37

15.35

Which package has the better price per bar?

The 10-pack costs $ per bar and the 12-pack costs $ per bar. The has the better price per bar.

Which package has the better price per ounce?

The cost per ounce of the 10-pack is $ and the cost per ounce of the 12-pack is $. The has the better price per ounce.

Which package do you think is a better buy? Complete the explanation.

Because I prefer the lower price per bar, I think that the - pack is the better buy.

Because I prefer the lower price per ounce, I think that the - pack is the better buy.

In order to find the price per bar, we divide the price by the amount of bars. For the first one:

15.37/10 = $1.54 per bar

The second package:

15.35/12 = $1.28 per bar.

The 10-pack costs $1.54 per bar and the 12-pack costs $1.28 per bar. The 12-pack has the better price per bar.

Now, let's look at the price per ounce. We do this in a similar way. We find the total amount of ounces in the package, and divide the price by the number of ounces.

In the first package, we multiply 10*2.1=21. We have 21 ounces in the first package. Now we divide 15.37/21. In the first package, we have 0.73 dollars per ounce.

Now, let's look at the second package. We start by multiplying 1.4*12=16.8. There are 16.8 ounces in the package. Now, we divide 15.35/16.8=0.91. So, in the second package, we have 0.91 dollars per ounce.

The cost per ounce of the 10-pack is $0.73 and the cost per ounce of the 12-pack is $0.91. The first package has the better price per ounce.

The better explanation is the second one, because I prefer the lower price per ounce, I think that the 1st pack is the better buy.