Capital of X = ₹2,50,000
Capital of Y = ₹3,50,000
\[
\text{Total Capital of X and Y} = 2,50,000 + 3,50,000 = 6,00,000
\]
X and Y together represent 80% share of profits.
\[
\text{Total Capital of the Firm} = \frac{6,00,000 \times 100}{80} = 7,50,000
\]
Z’s share = 20%
\[
\text{Capital to be brought by Z} = 20% \text{ of } 7,50,000 = ₹1,50,000
\]