1. The firm's total capital, determined by Aadi's contribution, is calculated as follows:
\[
\text{Total Capital} = ₹ 1,50,000 \div \frac{1}{5} = ₹ 7,50,000.
\]
2. The combined capital of the existing partners amounts to ₹ 2,00,000 + ₹ 1,80,000 = ₹ 3,80,000.
3. The firm's goodwill is determined by subtracting the combined existing partners' capital and Aadi's capital from the total capital:
\[
\text{Goodwill} = \text{Total Capital} - \text{Existing Partners’ Capital} - \text{Aadi's Capital} = ₹ 7,50,000 - ₹ 3,80,000 - ₹ 1,50,000 = ₹ 2,20,000.
\]