Explanation:

- Raja and Tulsi's investment ratio is 3:5.

- Raja withdraws half his capital after 4 months.

- Calculate Raja's effective investment: 3x for 4 months and then 1.5x for 8 months.

- Total capital months for Raja: \(3x \times 4 + 1.5x \times 8 = 12x + 12x = 24x\).

- Tulsi invests 5x for 12 months, which equals 60x capital months.

- Total capital months combined: \(24x + 60x = 84x\).

- Tulsi's share of profit ratio is \(60x/84x\).

- Calculate profit for Tulsi:

$$ \frac{60}{84} \times 16800 = 12000 \, \text{Rupees} $$.

- Your answer is indeed correct.