Using the data in the above table what is the real gdp for

Question

Year Nominal GDP (billions of dollar per year) Price level index (base year 2005=100)

2005 8,950 100
2015 9,250 120

Using the data in the above table, what is the real GDP for year 2005 (in billions of constant dollars)?
A.8,500
B.7,708
C.9,250
D.8,950