A grocer has a sale of $\text{Rs. }2,000$, $\text{Rs. }2,500$, $\text{Rs. }3,250$ and $\text{Rs. }4,250$ in $4$ months. How much should his sale in the $5\text{th}$ month be to get an overall average of $\text{Rs. }3,500$?

1. A
   Rs. 2,500
2. B
   Rs. 3,500
3. C
   Rs. 4,500
4. D
   Rs. 5,500