Create 2d animatied video for education consultancy.

I need few 2d animated videos for advertisement of educational consultancy. The target location is social media platforms and YouTube. So the video should be between 15 to 30 seconds. Those who have previous experience please send your similar works and your price. I need 3 to 5 videos. Later videos will be based on the result of the initial projects. Only serious people please message. If awarded, kindly provide the output and workfile.