Store a is offering two tubes of lip gloss for $7. the costs for lip gloss at store b are shown in the table. assume the cost for the lip gloss varies directly with the number of tubes. at which store does the lip gloss cost more? explain.

Hi,

I think this is the table, correct?

Number of Tubes        3                5                      7

Cost ($)                    12              20                     28

we can calculate the prize as the number of tubes multiplied by 4:
3*4=12
5*4=20
7*4=28

which means that one tube costs 4 dollars!

However, in the store A two tubes cost 7, which means that one costs half of this -3.5

So Store B is more expensive (4 dollars per 4 rather than 3.5 as in Store A).

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