You might be paying twice as much by ordering takeout food on DoorDash or Postmates, new study says

• You could be paying twice as much for fast food when you have it delivered, FinanceBuzz study found.
• McDonald's and Chick-fil-A orders were about 100% more expensive on Postmates and DoorDash: study.
• Besides tips and service fees, restaurants often also charge higher menu prices for delivery orders.

Ordering takeout food for delivery might cost you twice as much as picking it up yourself, depending on the delivery service you use, according to a new study.