With Microsoft technology, this can be done.
I switched my subscription from Office 2016 Personal to Business Essentials (it is cheaper, funny isn’t it?), and signed up for free Microsoft Power BI. (BI=Business Intelligence?)
Now, I just need to key in the sale amount everyday in Excel workbook, save it to OneDrive for Business, and publish it (to Power BI). Then, my employer will be able to view the online sale chart one hour later. (It is automatically refreshed every hour)
Here’s the screenshot of the online sale chart. (It is published publicly with very long and cryptic URL)
