I just don't see how making $376 on a $173 product qualifies s 68% margin. Calculates as 117% margin here.
FWIW, I made an approximate comparison for the iPod Touch (likely less expensive to make than an iPhone 5C):
Touch 16GB, BOM $173 @ 229 = $56 = 32,3% profit margin.
Again: The difference between BOM and sales price isn't gross margin.
BOM is Bills of Material - the price of a bag full of parts, somewhere in China.
You add the cost of building and testing and replacing iPhones that don't work.
You add the cost of shipping and any import taxes.
You add the cost of putting the phone into a store.
You add the cost of running a store.
You add the cost of processing a payment.
You add the cost of giving service, warranty repairs, returns and so on.
You add the cost of theft, damaged goods, and so on.
You add the cost of recycling.
When you have added all the things that Apple has to pay because you buy a phone, the difference between that total and the sales price is by definition "gross margin".
Then you add all the development cost, cost of advertisement and marketing, building stores, all the cost for all kinds of legal things, cost of running the company and so on. All the cost that Apple has to pay whether you buy an iPhone or not. The difference between that total and the sale price is "profit margin".
If that iPod Touch had a BOM of $173 and a sales price of $229 then you could bet that the gross margin would be negative. Apple would stop selling them because they would lose money on every sale. Profit margin would be massively negative.