Question

Toby is buying milk. He needs 3 liters. A​ half-liter of costs ​$2.43. A 250 ​-milliliter container of costs ​$1.42. What should Toby buy so he gets 3 liters at the lowest​ price?

Answer 1

6 half-liter

Explanation:

To get 3 liters of milk, Toby has two options:

Option 1: Buy 6 half-liter containers

The cost of one half-liter container is $2.43, so the cost of six such containers is 6 x $2.43 = $14.58.

Option 2: Buy 12 250-milliliter containers

The cost of one 250-milliliter container is $1.42, which is equivalent to $5.68 per liter (since 1 liter is equal to 4 250-milliliter containers). Therefore, the cost of 3 liters (which is equivalent to 12 250-milliliter containers) is 12 x $1.42 = $17.04.

Therefore, Toby should buy 6 half-liter containers as it is the cheaper option.