Nobody keeps track of how much money is left on the many gift cards they carry around with them. Here's an easy trick to always knowing: every time you use the gift card, use the receipt to check your new balance. Write the balance on the card with a fine-point permanent marker. The next time you use the card, cross off the old balance and write the new one under it. You'll always know how much is left on those cards without hoarding receipts.
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