What's something that's not common knowledge but you think everyone should know?
Lianrepl@kbin.social to 
Specifically thinking of stuff that make your life better in the long run but all kinds of answers are welcome!
I've recently learnt about lifetraps and it's made a huge positive impact on how I view myself and my relationships
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Move the decimal point one number to the left. That's 10% of the original number. Double that number to get 20% of the original number.
Now you have your tip.
Pay liveable wages like the rest of the developed world, with medical, retirement contributions, and taxes all sorted. Then you don't have to tip.
No one has to tip.
Tipping in the US is fucking wack. We have a service charge already on the bill and if i liked the service I tip, giving them more. Nobody should tip for standard service.
As a kid, I was taught to tip 15% for standard service. I still do that today.
20% is for exceptional service. 10% for mediocre. 2ยข for service that's so bad they should probably think about getting a different job.
Anyway, getting 15% is still very easy. Get 10% the way you said. Now add half of that.