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Math·Algebra·Linear equations in two variables

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During the month of January, an airport parking garage is offering a special price plan. According to this plan, the cost of parking in the garage for up to 5 days is $24 for the first day and $12 for each additional day. Which of the following equations gives the cost $C$, in dollars, of parking in the garage for $t$ days, where $t$ is a positive integer and $t\le 5$?

A

$C=24t-12$

B

$C=24t+12$

C

$C=12t+12$

D

$C=12t+24$