In many of the resources I've found in regards to the Black-Scholes Formula, it uses the natural logarithm (ln).  However, in the textbook that I am using (by Sheldon Ross), it uses the regular logarithm (log).  Everything else is the same, except for that.  Needless to say, a different answer results depending on which logarithm form is used.  For example, in one problem I've done, if I use the natural logarithm I get a cost of $1.82, but if I use the regular logarithm, I get a cost of $-1.37. Is there a reason why different logarithms are used?  If so, what version of the formula should I be using?  It seems to matter in the results.

Essentials Of Investments
11th Edition
ISBN:9781260013924
Author:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
Publisher:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
Chapter1: Investments: Background And Issues
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In many of the resources I've found in regards to the Black-Scholes Formula, it uses the natural logarithm (ln).  However, in the textbook that I am using (by Sheldon Ross), it uses the regular logarithm (log).  Everything else is the same, except for that.  Needless to say, a different answer results depending on which logarithm form is used.  For example, in one problem I've done, if I use the natural logarithm I get a cost of $1.82, but if I use the regular logarithm, I get a cost of $-1.37.

Is there a reason why different logarithms are used?  If so, what version of the formula should I be using?  It seems to matter in the results.

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