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At the risk of stating the bleeding obvious -
Not all cotton is the same. Not all stitching is the same. Not all manufacturing in China is the same. Not all zips, buttons, trims and other detailing are the same.
Two pairs of far east manufactured cargo pants can very easily cost $5 or $40 as a base cost even before factoring in volume.
You are, I'm afraid, talking out of your arse.
$30 at the most..
https://m.made-in-china.com/product/Loose-Casual-Men-prime-S-Trousers-Solid-Color-Pocket-Cargo-Pants-Trousers-for-Men-1956266345.html