All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu 'alyhi wa sallam, is His slave and Messenger.
Such a transaction is Ribaa and it is prohibited. It falls under Ribaa An-Nasee’ah (delayed) and Ribaa Al-Fadhl (excess) which are prohibited by the Quran, Sunnah and consensus of Muslim scholars. It is considered to be Ribaa Al-Fadhl because the lender will take his money in addition to an extra amount, i.e. the 700 dollars. The delay of one of the two payments causes this transaction to be a form of Ribaa An-Nasee’ah. Hence, this dealing is a Ribaa-based, which is forbidden. Traveling, facing hardships and losing an amount of money do not justify dealing in Ribaa. Lawful means must be pursued even if they are difficult and unlawful means must be avoided even if they are easy. Allaah The Almighty blesses lawful gains and eradicates blessings from the unlawful ones and those who acquire them.