EXPLANATION
Let's see the facts:
We have three companies:
Rent-All wich offers:
Days: 3 4 5 6
Cost: 55.50 74 92.5 111
We need to find the unit rate as follows:
[tex]\text{Slope}=\frac{\Delta\text{Cost}}{\Delta\text{Days}}=\frac{92.5-55.5}{5-3}=\frac{37}{2}=18.5\text{dollars}/\text{day}[/tex]In the case of A-1 Rentals Company, we need to turn the cost by a half day into a total day cost as shown as follows:
A-1 Cost/day = $15.99 $/half day * 2 = $