$7.$ A catalytic reforming process converts $30,000$ barrels of low$-$octane naphtha into high$-$octane gasoline with a yield of $85\%.$ How many barrels of high$-$octane gasoline are produced?

$8.$ In an alkylation unit, $15,000$ barrels of isobutane are used to produce $25,000$ barrels of high$-$octane gasoline. What is the yield of gasoline?