An army of 12000 consist of Europeans and Indians.The average height of a European is 5 Feet 10 inches and that od Indian is 5 feet 9 inchesand that of whole army is 5 feet 9$$\frac{3}{4}$$ inches.Then the number of Indians in the army is?

A

3000

B

4000

C

5500

D

2700