Which is more economical?

Question

Purchasing the economy size sack of beans at 8 kilograms for $13, or purchasing the regular size bag at 64 grams for $1.40?

either:

Neither is more economical.

The regular size is more economical.

The economy size is more economical.

Answer 1

the economy size

Answer 2

...the economy size is more economical!!

Answer 3

First, we put everything in the same units. 8Kg= 8000grams

So, then we look at price per gram.

$13/8000 grams = $.001625/gram

$1.4/64 grams= $.021875/gram

$.001625 is cheaper

The economy size is more economical