[dennisw]

I think the most amusing part is that the half-wit actually had to use a calculator to figure out 15%.
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Divide your restaurant tab by 7 for the tip. That comes as close as you need to result in a 15% tip.

[TexRef]

Divide your restaurant tab by 7 for the tip. That comes as close as you need to result in a 15% tip.

Good one! I hope that you are joking!!! The people that can't figure out 15% via multiplication, certainly can't do long division!!!

Personally, if the service is good, I tip 20% — not because I can't figure out the math, but just because I like to.

If the service is bad — that's another story...

[mamelukesabre]

It aint' that hard to figure 15 percent.

you can do 10 percent, can't you??

you can do 50 percent can't you??

you can add can't you??

just figure 10 percent, then figure 50 percent of that 10 percent, then add the two together. The result is 15 percent.