Marissa and haylie met for dinner in downtown Savannah. Marissa did flat-rate valet parking for $20. Haylie went to another valet and paid $5 up front and $2.50 for every hour, including the first hour. Ultimately the friends end up paying the same amount. How long did they stay? How much did each one pay?

6 hours; each paying $20

Step-by-step explanation:

To start off, we know that Marissa paid exactly $20 for parking. Since we know that Marissa and Haylie paid the same amount, we must now move on to Haylie.

Haylie paid $5 upfront. Now we must figure out how many hours Haylie must have stayed if each hour costed $2.50. We can figure this out by dividing $15 by $2.50 since Haylie already paid $5 upfront.

$15 / $2.50 = 6

This means that Haylie and Marissa stayed for 6 hours and paid exactly $20 dollars each.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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step-by-step explanation: