A major thrust at MITS and Pertec in the late 70's was to move the Altair product line from being a hobbyist computer to being a small business computer. Development of accounting software was a major component of this plan. This accounting software for the Altair later became the very popular Peachtree line of accounting software.
I have just posted the disk images of the Altair accounting software as it existing around 1978 at http://altairclone.com/downloads/basic/Floppy%20Disk/Accounting/
Mike