What is the formula for calculating operating income?

What is a good OPEX for an Amazon store?

I want to make sure that my idea of how much operating expenses should be is as realistic as possible. I want to keep my costs as low as possible, but we need to be realistic in the end.

Does COGS form part of operating expenses?

Do you need to keep original receipts for expenses?

Do I have to keep the original receipts, or can I keep scanned copies on my PC?

How do I use an Excel spreadsheet for tracking income & expenses?

Hi everyone, I want to track my small business expenses in Excel. Looking for pointers on how to do it. Thanks.

Tips when negotiating new supply contract.

My current supplier contract is coming to an end in 6 months and soon I'll need to start negotiating for a new one. Overall I've been very happy with my supplier and they are easy to work with bu