The tradition mentioned above has also been transmitted by Simak (b. Harb) with a different chain of narrators and to the same effect. The first version is more perfect. It does not mention the words "at the current rate".
حَدَّثَنَا حُسَيْنُ بْنُ الأَسْوَدِ، حَدَّثَنَا عُبَيْدُ اللَّهِ، أَخْبَرَنَا إِسْرَائِيلُ، عَنْ سِمَاكٍ، بِإِسْنَادِهِ وَمَعْنَاهُ وَالأَوَّلُ أَتَمُّ لَمْ يَذْكُرْ " بِسِعْرِ يَوْمِهَا " .
AbuDaud
Commercial Transactions (Kitab Al-Buyu) • Hadith 3355