Question

Which is more economical: purchasing the economy size of a detergent at 7 kilograms for $7.15 or purchasing the regular size at 870 grams for $.60? and by how much $ do you save by purchasing the more economical choice?

Answer 1

the regular size will be more economical
by $3.5

Answer 2

Answer:

The regular size is more economical.  You save $2.322.

Step-by-step explanation:

Consider the provided information.

We need to find the more economical purchasing.

The economy size of a detergent at 7 kilograms for $7.15  

The regular size at 870 grams for $.60

This can be written as:

$870\ gm=0.60$

Divide both sides by 870.

$1\ gm=\frac{0.60}{870}$

Now multiply both sides by 7000.

$7000\ gm=\frac{0.60}{870}\times 7000$  

$7\ Kg=4.828$ (∴1000 gm = 1kg )

Hence the cost of 7 kg regular size detergent is $4.828

Thus, the regular size is more economical.

For 7 kg economy size of a detergent we need to pay $7.15

For 7 kg regular size  detergent we need to pay $4.828

$7.15-$4.828=$2.322

Hence, you save $2.322.