Gran Turismo: Prize Money Calculations

3
United States
United States
Howdy all.
I am working on an RPG about racing and am trying to come up with a formula to use for calculating prize money post race.
I posting this to see if anyone has any ideas. I aim to make a formula that is simple and consistent, but offers a fair amount equal to the length of the race. (I.e. a 3 lap race on 1 mile course nets $3,000).
Originally was going to go with 1 lap=$1,000, but the draw back is, if you do one lap on a Targa di Florio (45-97 miles depending on track set up), you only make $1,000.
Please, lend me your ideas and suggestions.
 
This is really good. It's simple and effective.
I can use this for longer sprint races and endurance races.
Any suggestions for shorter tracks (like autumn ring mini) or multi-lap circuit races?
 
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