When a popular zoo parking lot is full, visitors can park in a nearby lot for free. The zoo pays the owner of that parking lot of the money collected from admissions after 3p.m. on that day. If, on a Saturday, the zoo collects $18,000 in admissions after 3p.m., how much does the zoo owe the owner of the other parking lot?
$48,000
$18,000
$9,550
$6,750
