If electrical energy costs $$0\mathrm{.}23$ per kilowatt$-$hour, how much do the following events cost?

$($a$)$

To burn a $120-$W incandescent lightbulb for $24$ h$.($Enter your answer in $$.)$

$

$($b$)$

To burn an equally bright $15\mathrm{.}0-$W LED lightbulb for $24$ h$.($Enter your answer in $$.)$

$

$($c$)$

To operate a $20\mathrm{.}0$ A$,220$ V electric oven for $7\mathrm{.}0$ h$.($Enter your answer in $$.)$

$