I received a C64 for Christmas one year.
I was a bowling league secretary back in those days, and in conjunction with a software package called LeagueBowl64, I was the first person at our local bowling establishment to calculate and print the weekly bowling statistics using a personal computer.
It sure saved a lot of time over doing things the manual way!
The C64 eventually gave way to a Radio Shack laptop called the LT1400 which I soon was using for handicapping the horses!