To calculate the capital employed, we first determine the super profit:
\[
\text{Super Profit} = \text{Average Profit} - \text{Normal Profit}.
\]
The normal profit is calculated as:
\[
\text{Normal Profit} = \frac{\text{Normal Rate of Return}}{100} \times \text{Capital Employed}.
\]
Let the capital employed be \( C \). The super profit is:
\[
\text{Super Profit} = ₹ 20,000 - \frac{8}{100} \times C.
\]
The goodwill is calculated as:
\[
\text{Goodwill} = 3 \times \text{Super Profit}.
\]
Substituting the given values:
\[
₹ 24,000 = 3 \times \left( ₹ 20,000 - \frac{8}{100} \times C \right),
\]
\[
₹ 24,000 = 60,000 - \frac{24}{100} \times C.
\]
Solving for \( C \):
\[
\frac{24}{100} \times C = 60,000 - 24,000 = 36,000,
\]
\[
C = \frac{36,000 \times 100}{24} = ₹ 1,50,000.
\]