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Bargain Rental Car wants to better understand the variable and fixed portions of its car washing costs. The company

operates its own car wash facility that cleans each rental car before releasing it to another customer. Management

believes the variable portion of its car washing costs relates to the number of rental returns. Accordingly, the following

data have been compiled:

Exercise $5$A$-2$ Part $2($Algo$)$

Using least$-$squares regression, estimate the variable cost per rental return and the monthly fixed cost incurred to wash cars.