Google Sheets Developer

I need to re-work a google sheets dashboard that I use to manage all client relationships, billing, and invoicing.

Need someone that can handle more complicated formulas and a math equation based on brackets,

Ex.
10% of first 100,000
5% of next 200,000

etc and calculate that automatically.

Please include the word "cookie" as the very first word in your application, that is how I will filter out the spam applications.

Also very important:

Please attach examples of dashboards that you've designed in the past. This is a quick job and I'm looking for advice, consulting, and project execution.

Looking for a flat rate- one-time project.