= 27d567bc2d48d9f40e9ccc20ea370b15)
gjm comments on Lifehack Ideas January 2015 - Less Wrong Discussion
You are viewing a comment permalink. View the original post to see all comments and the full post content.
= 783df68a0f980790206b9ea87794c5b6)
Loading…= b715d02e85f7b3b4ae65ca3d3e450868)
Subscribe to RSS Feed
Powered by Reddit
= f037147d6e6c911a85753b9abdedda8d)
You are viewing a comment permalink. View the original post to see all comments and the full post content.
Comments (43)
Is this really much easier than shifting the decimal place and then adding half the number? (Rounding at the start if you want, which you probably do.)
Haha, that's what I do.
If my cost is $14.32, I know $1.43 is 10%, and half of that is about $0.71, so the tip's $2.14 (though I tip 20%, which is even easier).
Right.
In the UK, we have a sales tax called VAT (for "value-added tax"). For a while its rate was 17.5%. The way you work that out is: shift the decimal point (10%), halve (5%), halve again (2.5%), and add up :-).
(Tips in the UK are usually about 10%, so that's a bit easier. And now our VAT rate is 20%.)
To expand on this method.
Take a number like 1230 10% of that number is 123.0 (found by shifting a decimal place) half of that is 61.5 add that to 123.0 =184.5 = 15%
Proposal: give waiters humanly decent salaries so they don't need the tips in the first place.
I'm strongly in favour of this but there isn't much I can do to make it happen. I imagine robot-dreams is in the same boat.