Assuming that at least some of the details are true... I sincerely doubt that this would be a roundtrip from Yemen and that you have a business that could repay $20k by the end of the year if you haven't got any savings and have to borrow even to get passports.
As I was curious about the passport price (I paid around 30 for mine a few months ago) being that high, I did a bit of google research and found a couple of sites.
This oneis a bit old (but is the most complete) , but prices match the other newer ones I have found. There you can read...
- Include an $82 fee for a new passport
- You can get the Application Form at the Consulate (2 ).
We can assume there may be some other fee, but that is still far from 600$ for a single passport
Then again, I found
this interesting piece of news (in Spanish)
Las autoridades yemeníes han dejado de expedir pasaportes como resultado de la alta demanda
Or translated to plain English
Authorities from Yemen halt passport issuing due to a high demand volume
So what I get from there, is that OP is asking us to lend some money to buy a passport in the black market

which would go against forum rules
17. Trading of goods that are illegal in the seller's or buyer's country is forbidden
Btw, where do you get from that he is from Yemen??