How much tax is on an item?

Question

the item costs $54.94 i live in california

Answer 1

California has many special taxing jurisdictions (districts), which are funded by a transactions (sales) and use tax rate that is added to the standard statewide rate of 7.25%.  See the site below and find your local jurisdiction.

http://www.boe.ca.gov/sutax/pam71.htm

Answer 2

Depends upon the local option tax rate.  No way to know without knowing where you buy the item.