i$.$A mobile base station $($BS$)$ in an urban environment has a power measurement of $45$W at $285$ m$.$ If the propagation follows an inverse $4$th power law what is a reasonable power value, in $$W$,$ to assume $1\mathrm{.}14$ km from the BS$?$

Express your answer in scientific notation to $2$ decimal places.

ii$.$While you are travelling, the mobile phone app you have installed displays a received signal strength of $72$ nW$.$ Assuming the same propagation law as in part $($i$),$ how far are you from the BS$?$ Give your answer in km to two decimal places.