Thank you for requesting I post in the answer box, and also thank you
for your question.
RECIPE 1 - SIMPLE SALES TAX
"Many online stores find it necessary to charge sales tax. Sales tax
is collected by the various states and, typically, is due if the
customer lives in a state in which the online company has an office.
If necessary, an additional charge is applied to the subtotal of the
order. The sales tax is listed in the shopping cart and updated
whenever the shopping cart contents change."
RECIPE 2 - DATABASE-DRIVEN SALES TAX AND SHIPPING
"Applying database-driven charges, like sales tax and shipping,
combines back-end preparation and front-end manipulation. On the
back-end, you'll need to enter records for all the areas you're
selling to in order to present the user with a set list of options.
For example, a database table of states and their respective tax rates
is needed to display a useable drop-down list of states. To handle
shipping charges, you'll also need shipping tables that include data
for every method of shipping you offer to every area; for example, if
you're shipping to New York from California, you'll need different
records for standard, two-day and overnight shipping."
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