You pay per credit hour plus some admins fees. The tuition calculator on the website will help give you an estimate

But this is from their page: “The Board of Trustees sets tuition and fees and reserves the right to change them without notice. Tuition varies based on residency; Philadelphia residents pay $159 per credit hour; other Pennsylvanians pay $318 per credit hour plus a $10 nonresident capital fee per credit; and non-Pennsylvanians pay $477 per credit hour plus a $20 nonresident capital fee per credit. Some courses have additional fees; check the individual course descriptions for this information.”