I don't understand people. They're stupid. This, I don't get.
Now, I can understand the casual, 'I'm just moseying through life--I don't need to think about every little thing' attitude. I don't like it, but it's just laziness. But it's when you want to find an answer and still refuse to think that makes no sense.
I recently posted a contest to guess the cash content of my wallet. Unsurprisingly, no one's gotten it, but after I while, I gave a hint: 'How many pennies would a sensible person have in his wallet'.
Nearly everyone ignored this. One guy popped in to say 'None, they're useless by themselves'. Of course, the tires on my car are useless by themselves, yet I keep them there whenever I want to go some place. Mentioning this merely confused the nut, though.
Anyway, I don't have the optimal number of coins in my pocket. Clearly, what one wants for exact change-making ability is 4*0.01 + 1*0.05 + 2*0.10 + 3*0.25 + optional: 4*1.00 or 2*1.00 (if you have a two dollar bill). This assumes you get to replenish your wallet between each transaction, of course.
I go for 4*0.25 because someone might want 'change for a dollar', and wouldn't be happy to be given a dollar bill for their dollar bill. (Though an excuse to short-change them one cent as a fee could be nice. Hmmm...) I have 8*0.10 because I like dimes. I have 2*0.05 because...well, no good reason.
I'm also lacking any ones at the moment, which is a problem.
Luckily I very rarely use cash.