Hello!
Although I am online marketing specialist, I bid this job since data entry is my daytime routine (lots of keywords and other information for the campaigns, writing reports etc.) so I am qualified for fast data entry tasks. Since I did not win any bids here so far, I desperately need my first job, and this looks like a nice opportunity in which everybody wins. Since I am an engineer I will certainly not have any problems with formulas and calculations you mentioned.
Regarding my Excel skills, I can assure you that they are on a high level, which is, I am sure, more than enough for the task you are asking.
If you have any questions or proposals, please contact me.
Best regards,
Vladimir