Answer
G
Work Step by Step
We can make the ratio equal each other because the ratios between the model and the full-scale library must be equal on both sides. Thus we get,
$\frac{8}{100} = \frac{x}{35}$
Cross multiple
$ 8 \times 35 = 100 \times x $
$ 280=100 x $
Divide both sides by 100
$ \frac{280}{100}=\frac{100 x}{100} $
$ x=2.8$
The answer is 2.8 which is option G.