Suppose the money demand function is M d $/$P $=2000+0\mathrm{.}2$Y $-1000($r $+$ e $).($a$)$ Calculate velocity if Y $=4000,$ r $=\mathrm{.}06,$ and e $=\mathrm{.}04.($b$)$ If the money supply $($M s $)$ is $3900,$ what is the price level? $($c$)$ Now suppose the real interest rate rises to $0\mathrm{.}11,$ but Y and M s are unchanged. What happens to velocity and the price level? So if the nominal interest rate were to rise from $0\mathrm{.}10$ to $0\mathrm{.}15$ over the course of a year, with Y remaining at $4000,$ what would the inflation rate be$?$