Step 1: Work out the salaries paid to the working partners.
Total profit = Rs. 27,000.
A's salary = 10% of 27,000 = \( \frac{10}{100} \times 27000 = \) Rs. 2,700
B's salary = 20% of 27,000 = \( \frac{20}{100} \times 27000 = \) Rs. 5,400
Total salary paid out = 2,700 + 5,400 = Rs. 8,100
Step 2: Find the profit left for capital-based sharing.
Remaining profit = 27,000 - 8,100 = Rs. 18,900
Step 3: Write the capital ratio of A, B and C.
A : B : C = 6000 : 9000 : 12000 = 2 : 3 : 4, so total parts = 2 + 3 + 4 = 9
Step 4: Find C's share.
C is not a working partner, so C draws no salary. C's entire earning comes from the capital-ratio split of the remaining Rs. 18,900.
C's share = \( \frac{4}{9} \times 18900 = \) Rs. 8,400
So the share of C is Rs. 8,400, which matches option (d).