A sum invested at compound inrerest amounts to ₹8,000 in 4 years and ₹8,400 in 5 years, interest being compounded yearly. What will be the amount of the same sum at the end of the $$6^{th}$$ year?

A

₹8,820

B

₹9,000

C

₹8,904

D

₹8,988