One brand of popcorn cost $2.00 for 1 pound 9 ounces and the second brand costs $2.10 for 1 pound 14 ounces. Which is a better buy and why?

Hint : 16 ounces = 1 pound

Let's divide and see how much the popcorn cost per ounce, then we can see which is the better priced brand.

first brand: 16 ounces + 9 ounces = 25 ounces

$2.00/25ounces = $0.08

second brand: 16 ounces + 14 ounces = 30 ounces

$2.10/30ounces = $0.07

So, since $0.08 is less than $0.07, the second brand is the better buy.