$($k$).(30)$

$($a$)3kg200C1000C.,0\mathrm{.}241$kca$\frac{l}{k}g*C,0\mathrm{.}172$kca$\frac{l}{k}g*C.$

$($b$)\frac{5}{b}ar,200C1\mathrm{.}5kg350C,\frac{100}{b}ar$