To calculate the GDP growth rate from year 1 to year 2, you can use the formula:
\[ \text{Growth Rate} = \left( \frac{\text{GDP in Year 2} - \text{GDP in Year 1}}{\text{GDP in Year 1}} \right) \times 100 \]
Substituting in the given values:
\[ \text{Growth Rate} = \left( \frac{7.5 , \text{billion} - 6 , \text{billion}}{6 , \text{billion}} \right) \times 100 \]
Calculating the difference:
\[ \text{Growth Rate} = \left( \frac{1.5 , \text{billion}}{6 , \text{billion}} \right) \times 100 \]
Now perform the division:
\[ \text{Growth Rate} = \left( 0.25 \right) \times 100 \]
Finally, we obtain:
\[ \text{Growth Rate} = 25% \]
Thus, the correct answer is:
25%