So we need to figure out which is the best buy. In order to do this we must look at a particular variable: the price per ounce of peanuts. This price is given by dividing the total price of a certain amount of peanuts divided by its weight in ounces. So for the Barrel brand we get:
![(3.39)/(10)=0.339](https://img.qammunity.org/2023/formulas/mathematics/college/rcps0ceyeqpjdgnbzsz2zko7f5fq2phmom.png)
So the Barrel peanuts cost $0.339 per ounce. For the Mr. Nut peanuts we get:
![(4.54)/(14)=0.324](https://img.qammunity.org/2023/formulas/mathematics/college/nj5l4gtca17ptdpexl0zmlptzszu39uhgf.png)
Then the Mr. Nut peanuts cost $0.324 per ounce. Finally, the price per ounce of the Chip's peanuts is:
![(6.26)/(18)=0.348](https://img.qammunity.org/2023/formulas/mathematics/college/x724fcb7kjj1jbrwe311cog5hxkkg19m0b.png)
Then, the cheapest peanuts are those of the brand Mr. Nut and that is the best buy.