<human>: My boyfriend and I went to a bar last night in Woodinville (King County) for an anniversary celebration. We paid separately and left without any incident. This morning bf randomly checked his receipt and noticed that the tax charged to him was 10% of the subtotal. Checked on my bill and the tax was 10% also. We then double-checked and confirmed that the sales tax rate in the area is actually 9.5% (6.5% state plus 3.0% local/county).

While we're sort of peeved that we got overcharged, the difference in tax on both our bills is laughable ($0.03 and $0.21) so there's no desire for personally suing for compensation. I'm just concerned that the place may be "skimming off the top" sort of speak; overcharging everyone on tax and pocketing the difference.

We've been to this bar a few times before but this is the first time we've noticed this issue (I usually either throw away or crumple the receipt in my pocket and wash it in the laundry days later). No idea at all if this has been going on for a while. Haven't notified the bar yet because we just discovered it and the bar's not open yet today. 

So here are my questions:

* Is there any possible legal justification for "rounding up" or otherwise charging more in tax than what the state specifies? 

* Should I be nice and notify the bar first of this discrepancy? I guess there's a possibilty that their registers are set up wrong and they haven't noticed yet. Just don't want to act like a bitch and immediately call them thieves.

* If I do in fact need to report this to the state regardless of second question, how do I go about doing so?

Thank you for reading this huge block of text, and for any advice!

Give me a shortened version of the text
<bot>: A bar charged 10% sales tax on two separate bills in one night. The sales tax rate is actually 9.5% Is this legal, and if not, how do I go about reporting this?