Hi, there!
My name is Paris, and I was glad to see that you're looking for an Excel developer. According to your brief, you want to have an Excel calculator. I plan to use a combination of formulas to accomplish this. I will charge you $150* and can deliver within five days (we can discuss the milestones, I don't require any payment in front).
I'm among the most experienced and skilled Excel and VBA developers on this platform. In particular, I am in the top 2% of the freelancers having completed over 340 projects successfully in less than 7 years, and I feel confident in achieving your task as well.
I'm online from 7 am to 9 pm, Athens time (including weekends).
I'm looking forward to working with you.
Sincerely,
Paris Pallas
*My quote is indicative and may change after we discuss the tasks needed in detail.