To solve this you need to first convert days to minutes
24 hours in 1 day
8 days times 24 hours
8 x 24= 192 hours
60 minutes in 1 hour
192 hours times 60 minutes
192 x 60 = 11520 minutes in 8 days
now that you have minutes you can set up a ratio
$5 per 7 minutes is x dollars per 11520 minutes
5 x
------- = ----------
7 11520
solve this for x
multiply by 10520
5/7*11520=x
x=$8228.57