Computer exercises and solutions in signal processing I am very interested in this question and can literally not find anywhere a simple answer, so apologize in advance if it does not fit well this community. 

I am looking for either an online resource or a book with computer exercises and solutions in signal processing (can be really anything in this space). I am interested in practicing independently, and while there are countless sources for practice computer exercises, I could not find any source that has solutions as well. Don't mind buying a $100 text book if needed. Appreciate any help in this direction.
"Digital Signal Processing: A Computer-Based Approach"  by Sanjit Mitra is what you need I guess, especially the exercises at the end of each chapter. There is a booklet on the Internet again by Mitra, named Digital Signal Processing Laboratory Using MATLAB.
The other option could be Practical Signals Theory with MATLAB Applications.