To find the unit rate at which Rebecca spent money on paper towels, we need to divide the total amount spent by the number of rolls purchased.
Rebecca spent $40.08 on 24 rolls of paper towels.
Unit rate = Total amount spent / Number of rolls purchased
Unit rate = $40.08 / 24
Now, we can perform the division:
Unit rate = $1.670
So, the unit rate at which Rebecca spent money on paper towels is approximately $1.67 per roll.