Algebra-2

Question Analysis
This question tests the understanding of direct variation and its application in a real-world context. The student needs to determine the constant of variation and then use it to find the cost for a different number of days.

Key Concept Explanation
In direct variation, the relationship between two variables and can be expressed as , where is the constant of variation. Here, the cost of renting a car ( ) varies directly with the number of days ( ), so .

Step-by-step Solution
1. Identify the given values: when .
2. Use the formula

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