The Commodore 64 had a reputation for being a games machine and thus was often not taken very seriously but for at least the first several years of its life there were a number of productivity titles and even professional business software available.
This particular ad is from the March/April 1986 issue of Commodore MicroComputer and is for the VersaBusiness Series. This includes VersaReceivables, VersaPayables, VeraPayroll, VersaInventory, and VersaLedger II. I can’t claim to know anything about this software or what the difference was between the different versions for different machines but it was available for a lot of them including Apple II, DOS, CP/M, Macintosh, TRS-80, and of course the Commodore 64. It wasn’t cheap, $550 if you wanted it all, but they were running a special 50% discount for the Commodore version in this ad so you could have had them all for the low, low prices of $225.