A and B started a joint firm. A's investment was thrice

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A and B started a joint firm. A's investment was thrice the investment of B and the period of his investment was two times the period of investment of B. If B got Rs. 4,000 as profit then their total profit is ?

1. Rs. 24,000
2. Rs. 16,000
3. Rs. 28,000
4. Rs. 20,000

Correct Option: C

Suppose B invested Rs. x for y months.
Then A's investment is Rs. 3x for 2y months.
Ratio of investment of A and B = 6xy : xy = 6 : 1.
Now B's share = Rs. 4,000
∴ A's share = Rs. 24, 000
Hence, Total profit = Rs. 28,000