Final answer:
In the first problem, the second option has a lower unit price and is the better price. In the second problem, the second option has a lower unit rate and is the better buy. In the third problem, the cost per ounce for product A is $0.0236 and the cost per oz for product B is $0.036.
Step-by-step explanation:
For the first problem, we can find the unit price by dividing the total cost by the amount of coffee. The unit price of the first option is $4.50/14 oz = $0.3214 per oz, and for the second option, it is $3.75/12 oz = $0.3125 per oz. Therefore, the second option has a lower unit price and is the better price. For the second problem, we can find the unit rate by dividing the total cost by the amount of rolls. The unit rate for the first option is $20.91/18 mega rolls = $1.1617 per mega roll, and for the second option, it is $5.99/8 triple rolls = $0.7488 per triple roll. Therefore, the second option has a lower unit rate and is the better buy.
For the third problem (a), the cost of each can for product A can be found by dividing the total cost by the number of cans. The cost per can is $3.67/12 cans = $0.3058 per can. The cost per ounce can be found by dividing the cost per can by the number of ounces, which is $0.3058/13 oz = $0.0236 per oz. For the third problem (b), the cost per liter for product B is $2.46/2 liters = $1.23 per liter. The cost per oz can be found by converting liters to oz using the conversion rate 1 liter = 33.8 oz, which is $1.23/33.8 oz = $0.036 per oz.