The sales for 5 days are given as: ₹5,000, ₹6,000, ₹8,000, ₹7,000 and ₹9,000. What must the sales be on tbe $$6^{th}$$ day so that the average becomes ₹8,500?

A

₹16,000

B

₹12,000

C

₹15,000

D

₹10,000