[Paid ads-free version]
As title, QST Calculator is a simple calculator for the Quebec Sales Tax (QST/TVQ) as well as the GST.
Dedicated for the daily use of the Quebecers!
For ad-supported free version, look for "QST Calculator (free)".
Known issue: if your decimal delimiter is comma instead of point, screen keypad might cause problem.
Note: our Google Market account is outside Canada, so you don't have to pay and sales tax for buying this app =)