$A$, $B$, and $C$ are partners with an equal profit sharing ratio ($1:1:1$). Their fixed capitals are $\text{Rs. }30,000$, $\text{Rs. }25,000$ and $\text{Rs. }30,000$ respectively. $C$ decides to retire. $A$ and $B$ decide to continue the partnership firm and change their new profit sharing ratio into their respective Capital Ratio. What is the gaining ratio of $A$ and $B$?

1. A
   $6:5$
2. B
   $1:1$
3. C
   $7:4$
4. D
   $3:2$