The formula for calculating the percentage change in Real GDP is:
\[
\text{Percentage Change in Real GDP} = \frac{\text{Real GDP in 2022-23} - \text{Real GDP in 2020-21}}{\text{Real GDP in 2020-21}} \times 100
\]
From the data, we have:
\[
\text{Real GDP in 2022-23} = 6,000 \quad \text{and} \quad \text{Real GDP in 2020-21} = 5,000
\]
Substituting these values into the formula:
\[
\text{Percentage Change in Real GDP} = \frac{6,000 - 5,000}{5,000} \times 100 = \frac{1,000}{5,000} \times 100 = 20\%
\]
Therefore, the percentage change in Real GDP in the year 2022 – 23 is 20\%.