How the Online Whiteboard works for Skype sessions

I do almost all of my Test Prep over Skype these days using an online whiteboard. In the video below I show how I’d explain the following SAT Math problem:

“A company that makes behind the scenes videos on movie sets purchased new camera equipment for $39,000. The equipment depreciates in value at a constant rate for 15 years, after which it is considered to have no monetary value. How much is the camera equipment worth 5 years after it is purchased?”

A) $13,000
B) $19,500
C) $26,000
D) $36,400

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