If you go through the gold swapping section on sythe you see it is about 1:5 for your 07 for someone elses Rs3 or 1:7.5 for your Rs3 for someone elses 07. Depends on what gp type Karbon wants to end with for the Rs3:07 rate. If wants to end with Rs3, 1:5 is fine. If wants to end up with 07 gp, 1:7 is fine.
Also, I'm not bidding any higher on this. Just wanted to leave this one last note behind