Calculating Total Cost With Percentages

Krista is going on a road trip using a rental car. There is an untaxed base fee of $8 and then each mile is $0.05 and taxed at 0.5%. What is the total cost (c) of the car if Krista drives for m amount of miles?

c(m)=1.05(0.05m)+8

c(m)=0.05(0.05m)+8

c(m)=1.005(0.05m)+8

c(m)=1.005(5m)+8