Question 1147480
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S(4.5) is the cost of renting the car for 4.5 days.  Since the cost after the first day is for full or partial days, that will be the same S(5).<br>
That means the first day cost plus 4 times the additional day cost.<br>
Plug in the numbers and do the arithmetic.<br>
P.S. What kind of car are they renting? a Lamborghini?