Consider Sang will rent over 5 days and tha the estimated distance is 580 miles.
In order to determine what is the best option Sang can choose, calculate the money he would spent for each option, just as follow:
Ace rental: $54 daily, unlimited mileague
$54 x 5 = $270 total cost
Bekins rent a car: $22.95 daily, 20c/mile
20 cents = 0.2 dollars
$22.95 x 5 = $114.75 over the 5 days
$0.2 x 580 = $116 over the 580 miles
$114.75 + $116 = $230.75 total cost
Carl's Easy Rentals: $19.95 daily, $3.50/day insurance, 10c/miles
$19.95 x 5 = $99.75 over 5 days
$3.50 x 5 = $17.5 day insurance
$0.10 x 580 = $58
$99.75 + $17.5 + $58 = $175.25
Based on the previous results, you can conclude:
THe best option Sang can choose is Carl's Easy Rentals.