Well, things like sporting events, or freak storms are measured in days, or weeks. Depends. For weather, it could be hurricanes, tornado's, or even large fires(not quite weather, but could be)
Answer:
I have to go get my car from the doctor office today
34.95 x 18%= 6.29
34.95-6.29= 28.66
$28.66 is the sale price