John recently wrote in:
I told my kids I would float their repayment of a Xbox Live subscription since it came due before any of us realized they should have been saving for it. At any rate, they owe us $21 each, and I want them to pay $7 every other week. What’s the best way to track this, preferably in a way that they can see it — I guess it’s basically a loan.
Here’s my suggestion: