$2+1=3pts$ Monica consumes two things: gasoline $(G)$ and bread $(B).$ Monica's utility

function $is$

$U(G,B)=10G^{0\mathrm{.}25}{B}^{0\mathrm{.}75}$

Monica's income $is$ I and the prices $of$ gasoline and bread are $p_G$ and $p_B,$ respectively.

$a.$ Derive Monica's demand curve for gasoline.

$b.If$ the price $of$ gasoline rises, how much does Monica reduce her consumption $of$ gasoline?