Concept:
Under the GST system, a dealer pays tax only on the value added.
\[
\text{Tax payable} = \text{Output GST} - \text{Input GST (ITC)}
\]
Step 1: Purchase price and Input GST.
Retailer buys TV for ₹20,000.
GST @ 18%:
\[
\text{Input GST} = 18% \text{ of } 20000 = 0.18 \times 20000 = ₹3600
\]
Step 2: Selling price before GST.
Profit = 10% of 20,000 = ₹2,000
\[
\text{Selling price (before GST)} = 20000 + 2000 = ₹22000
\]
Step 3: Output GST on sale.
GST @ 18% on ₹22,000:
\[
\text{Output GST} = 0.18 \times 22000 = ₹3960
\]
Step 4: GST payable to Government.
\[
\text{Net GST} = \text{Output GST} - \text{Input GST}
\]
\[
= 3960 - 3600 = ₹360
\]
Conclusion:
The retailer pays only the tax on value addition, which is ₹360.