One Commodry Market Model

$G{Q}^0=a-bP,a,b>0$

$G{Q}^5=-c+dP,c,d>0$

$G{P}^{**}=\frac{a+c}{b+d},Q^{**}=\frac{ad-bc}{b+d}{P}^{**}$ and $Q^k$ are "reduced form" equations. How many $($comparative $-$ static derivatives are

there?