How do I set Tax calculation key on Casio HR-150TE calculator?

How do I set Tax calculation key on Casio HR-150TE calculator?
We have a business, but seldom have to add tax. We are coming to a specific situation that we need to add a local option sales tax, and my calculator has Tax+ or - keys, but I've lost the manual and don't know how to set the keys! Would appreciate help. Thanks!


Answers:

Chosen Answer
PepsiLime:  You might want to try asking this question in an equipment section, rather than in a tax section.
2007-09-26 09:51:18