To calculate the Gross Profit Ratio, we need to first find the gross profit. The formula for Gross Profit is:
\[
\text{Gross Profit} = \text{Revenue from operations} - \text{Cost of Goods Sold (COGS)}
\]
Where COGS is calculated as:
\[
\text{COGS} = \text{Purchases} + \text{Carriage inwards} + \text{Decrease in inventory} - \text{Returns outwards}
\]
\[
\text{COGS} = 3,00,000 + 60,000 + 40,000 - 20,000 = 3,80,000
\]
\[
\text{Gross Profit} = 10,00,000 - 3,80,000 = 6,20,000
\]
Now, Gross Profit Ratio is given by:
\[
\text{Gross Profit Ratio} = \frac{\text{Gross Profit}}{\text{Revenue from operations}} \times 100 = \frac{6,20,000}{10,00,000} \times 100 = 62%
\]
Hence, the Gross Profit Ratio is 62%.