I need just a formula

[Sam99]

I've a problem.

I need market price of a particular share; and I've these information:
1. Face value (basic price) of the share
2. Lot size of the share
3. Previous day closing price of the share

Now using these, how can I get market price of the share?
Any formula or procedure exists there? Help me if so. Thanks.

NB: I am trying to write a function, which takes these information and returns the desired market price.

[keskiverto]

That is not a programming question.