If you want an easy way for big money & XP in a short time, there is a way to do it.
Step 1: Set up a 60 lap race at Motorcity circuit, realistic damage against Lawnmowers.
Step 2: Bring a car with some heavy amour.
Step 3: Wreck all the lawnmowers,(Wouldn’t advise going backwards round the track.)
Step 4: After wrecking all Mowers, go further up the track from the last wrecked Mower and then wreck yourself out.
If done correctly, you’ll get the payout as if you did the full race distance, over 12k cash and around 70k xp(depending on how many Mowers you’ve wrecked.
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Best part? with a little luck you can do it quicker than a 2 minute deathmatch while getting around 5x the payout of it.
But I understand if people want to earn it the normal way, I only learned about it when I had 4 cars left to buy.