Just imagine the Prin.

industriously counting away at thousands of pennies, and a long line of boy and girl students in line, each one waiting to pass him another handful of _pennies_! Say, can you see the Prin .-- -just turning white and muttering to himself?
But there's no chance to get the word around, now!" "We don't need to get the word around," smiled Dick.

"If we passed the word around, it might get to the Prin.'s ears before Monday, and he'd hatch up some way to head us off." "If you can see how to work the trick at this late hour, you can see further than I can," muttered Dan, rather enviously.
"Oh, Dick has the scheme hatching, or he wouldn't talk about it," declared Dave Darrin, confidently.
"Why, if all you want is to send the whole student body on Monday morning, each with fifteen copper cents to hand the Prin., that can be fixed up easily enough," Dick pronounced, judicially.
"How are we going to do it ?" asked Dalzell, dubiously.
"Well, let us see how many pennies would be needed?
There are close to two hundred and fifty students, but a few might refuse to go into the trick.

Let us say two hundred and forty _times_ fifteen.

That's thirty-six hundred, isn't it?
That means we want to get thirty-six dollars' worth of pennies.