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SUBMIT YOUR IDEAHi @george317,
The cost of $1.10 per mile is mentioned in the question (see highlighted section below).
Honestly, I am not sure what the third data input is for, perhaps it is a leftover part of the Grand Prix - I did not use it in any part of my solution and I haven't noticed any of the other posted solutions using it either.
Hope that helps.
David
Spatial 4
My solution