Atoms and Nuclei: JEE Main 2018 Physics question

A solution containing active cobalt ${^{60}_{27}}Co$ having activity of $0.8$ $\mu Ci$ and decay constant $\lambda$ is injected in an animal's body. If $1\,c{m^3}$ of blood is drawn from the animal's body after $10$ hrs of injection, the activity found was $300$ decays per minute What is the volume of blood that is flowing in the body ? $\left( {\,\,Ci = 3.7 \times {{10}^{10}}\,} \right.$ decays per second and at $t=10$ hrs $\left. {{e^{ - \lambda t}} = 0.84} \right)$