No idea. Without knowing how long it takes to assemble the iPod we don't know the actual labour costs. Without knowing any of the overhead costs, we don't know what it costs Foxconn to just own the factory.
Also, consider that nobody making these things wants their competition to know the numbers that you are looking for.
Also, don't forget to account for the R&D costs. These things don't just spring from the minds of JI and SJ fully formed. There are some very well paid engineers in California that are designing the products. Not just the products that are released, but all those products that never see the light of day. Those costs are also paid for from the sold iPods. Also the research labs in Cupertino, with all of those associated overhead costs.
But wait, there's more. Once a design is finalized, the people who make the thing have to figure out a) what parts they need to source, b) what shape those parts have take in order to fit inside the case, c) in what order, and how, those parts are put into the iPod, d) perhaps custom tools need to be built, e) assembly lines have to be created (the right bins with the right parts at the correct places), f) workers need to be trained, g) etc etc
The first iPod that comes off the line has cost Apple and Foxconn tens of $Millions. Every other iPod that comes off the line not only needs to be built at a profit, it also needs to partially pay off the costs of that first iPod. Eventually Apple hopes to sell enough iPods that they are (finally) turning a profit.
Hope you get a good mark on your essay ...