Hi,
my name is Esteban Salpeter and I'm an expert MS Office developer, with many years of experience on that platform. You can check out my portfolio to view some of my work.
Your requirement is very clear, so the modifications can be done easily. All you'll have to do is tell me what calculations you need and where, and I'll do it.
Feel free to ask me any questions before contracting, I'll be glad to chat with you.
Hoping to start working together soon,
Best regards,
Esteban