You can
put this solution on YOUR website!Let 'x'= no. of miles travelled
We need to equate the 2 rates to have a basis which one is better rate.
Rate 1 = Rate 2

-----------> x=800 miles
Now, we used travelled miles 'x'= 800
For Rate 1:

For Rate 2:

See, you'll pay the same if travelled 800 miles.Choose Rate 1 or 2 doesn't matter.
If 'x' = 799 miles (1 mile less on our basis)
Rate 1:

= $215.82
Rate 2:

= $215.91
See, if you travelled less than 800 miles, RATE 1 is a better choice. More less travel, more discount you can get.
.
If 'x'= 801 miles ( 1 mile up on our basis)
Rate 1:

= $216.18
Rate 2:

= $216.09
See, if you start to travel more than 800 miles, RATE 2 is a better choice. More travel you do than 800 miles, the better savings you get.
Try it if you travel 1200 miles? 1500 miles? ----> RATE 2 is the choice!
Thank you,
Jojo