# Need help creating an algebra-like formula

#### msdclark

##### New Member
I wasn't good at Algebra because I should get this if I were.

I have the following:
V = number of bottles of product
W = price paid by customer
X = cost of bottle
Z = Free bottle

Normal price of bottle is 14.50
Customer needs to pay 14.00 a bottle
I can provide free bottles to make up the difference, but I can't lower price.

What is the ratio of bottles that need to be purchased along with number of free bottles I need to provide him to get the final bottle cost as close to 14.00 as possible?
It can be any ratio of purchased bottles to ratio of free bottles, but I can't figure out how to create a formula that lets me plug each of these amounts in.

The next time I'm faced with this situation the bottles will cost a different amount and the customer will pay a different amount.

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