Refer to the following table: 
What is marginal benefit for the 3rd unit of the activity?
Definitions:
POTX
A file extension for a Microsoft PowerPoint template that provides a predefined slide design and layout.
PNG
A raster graphics file format that supports lossless data compression, known as Portable Network Graphics.
PPT
An abbreviation for PowerPoint, a popular presentation program by Microsoft that enables users to create slide-based presentations incorporating text, images, and multimedia.
Apply A Style
The act of assigning a specific set of formatting attributes to text or other elements within a document or application.
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