math question please help

Question

Three brands of cornflakes are available.

Brand​ G:

​$2.59

for

10

ounces

Brand​ K:

​ $3.89

for

18.5

ounces

Brand​ P:

​$3.19

for

15.2

ounces

You have a coupon for

30¢

off Brand​ P, and a coupon for

40¢

off Brand G. Which cereal is the best​ buy?

Which brand is the best​ buy?

A.

Brand P

B.

Brand K

C.

Brand

help meh

Answer 1

G is .259 per ounce, but with .40 off of 2.59 cost is 2.19, and .219 per ounce

K is 3.89/18.5 = about .2103 per ounce

P is 3.19/15.2 = about .2099 per ounce, but with .30 off cost is 2.89 and .190 per ounce

P < K < G

P is least expensive, with the coupon, or even without the coupon

although if all you had were the coupons and just $2.60, G would be the only feasible option. You couldn't afford the others if all you had was $2.60

Answer 2

Hi Bob!

Here is the math breakdown of your problem.

Initial costs:

Cereal G = 2.59 for 10 oz

Cereal K = 3.89 for 18.5 oz

Cereal P = 3.19 for 15.2 oz

After Coupons:

Cereal G = 2.19 for 10 oz

Cereal K = 3.89 for 18.5 oz

Cereal P = 2.89 for 15.2 oz

Cereal G costs 0.219 per ounce (2.19 / 10)

Cereal K costs 0.210 per ounce (3.89 / 18.5)

Cereal P costs 0.190 per ounce (2.89 / 15.2)

I'm assuming you need the most cost effective choice from the cost per ounce. So Cereal Brand P is your best option and the answer is A.

Hope this helps!