Step 1: Understand the situation.
X and Y's combined capital is:
\[
2,50,000 + 3,50,000 = 6,00,000
\]
Z is to have a 20% share in the profits. Therefore, Z’s share of the total capital should be 20% of ₹6,00,000, which is:
\[
\text{Z’s capital} = 0.20 \times 6,00,000 = 1,20,000
\]
Step 2: Conclusion.
Z needs to bring ₹1,20,000 as capital to maintain a 20% share in the firm’s profits.