Everything Costs $100 With a Debit Card

When does $30 worth of gas cost $100? When you use your debit card at the pump. If you use debit, gas stations and retailers often block your card for $100 or so. That money is in your checking account, but it's not available until the retailer gets back to your bank with the actual transaction amount -- sometimes days later. To learn more about it, listen to this audio story from Marketplace Money.