A, B and C entered into a partnership. A invested Rs. 2,560 and B invested Rs. 2,000. At the end of the year, they gained Rs. 1,105 out of which A got Rs. 320. C’s capital was:

Rs. 4,280

Investment ratio is directly proportional to profit ratio if time is same.

Here,

Investment ⇒ A : B : C = 2560 : 2000  :    x

Profit ratio ⇒ A : B : C =    320 :  250   :   \(\frac{x}{8}\)

ATQ, 

A's profit = 320

B's profit = 250

hence C's profit = 1105 - 320 - 250 = Rs.535

C's profit =  \(\frac{x}{8}\) = 535

x = 535 × 8 = Rs.4280