Bank Rates in Iran starts from 7% you can check it here http://www.sinabank.ir/index.php?newlang=eng in interest rate pages
you can check USD to IRR ( Iranian rials ) here http://www.sinabank.ir/pmk/244-%D9%86%D8%B1%D8%AE-%D8%A7%D8%B1%D8%B2.html

I have around 168000 usd cash in my account and will accept to invest it for you in Iranian banks ; i can provide my account balance statement in English that you can check it out from bank, and my passport copy as well, only to serious investors.

I have an office in Tehran and it would be my honor to be your host if any one would likes to invest in person ( for large amounts )

min investment is 1000 usd and the returns are calculated with rates in above link in payment due dates
i accept and make payments in BTC only

for more info please send pm.