For all the haters who haven’t studied business - a brief lesson. Foxconn and Apple are in different lines of business with implicitly different profit margins. Foxconn assembles, packages ant tests devices - a low margin business. Apple invents, designs, develops, markets, etc, etc finished products. The gross margin is simply that portion of the revenue of the finished product over the manufacture cost. It does not include design, engineering, R&D, marketing (you get the idea). Gross margins must be high enough to cover these costs
if Foxconn wants higher margins ( not btw, the same as return on investment - a more useful measure) maybe it should develop the fphone , or fox phone and enter that line of business. But, they would not necessarily garner more profit for the investment required