"Apple has entered the market for MP3 Players, smartphones and tablets. How attractive are these markets versus the PC industry?" A chart or graph can be used. Also, it will be grateful to contain Porter's five forces model or any strategic analysis.
Here is the link for HBR article: http://www.javeriana.edu.co/Facultades/Arquidiseno/educacion_continua/documents/CaseApplein2010.pdf