Can you explain question number 2. for me ?

You would pay $33 for the day you were driving it. And you have to add $1 to that fee of $33 for every mile you drive.

So since you drove the truck 300 miles you would do 300 x $1 = $300, so then you would add those $300 + $33 = $333

Final $333

20000 as first it increases by 2500 then by 5000 so next it will increase by 10000