Answer:
t = r + cm
Explanation:
t = total amount of money spent on rental car
r equals the original payment amount (like how much it cost to even attain tthe car)
c = the number of dollars for every mile
m = amount of miles
You would multiply c and m since every mile the dollars goes up by itself
You need to add the original payment, r, to find the correct total
If there is no original payment then the formula could also just be :
t = cm
total = miles x money per 1 mile
I could provide better explanation if I had the chart you mentioned but hope this helps!