Time span of human life \(=10^9 \,s\)

Age of universe \(=10^{17} \,s\)

So, \(\frac{\text { Age of universe }}{\text { Time of human }}=\frac{10^{17}}{10^9}=10^8\)

If, \(\frac{\text { Age of universe }}{100}=10^8\)

\(\Rightarrow \text { Age of universe }=10^{10}\,s\)