GTAV - Agency - Payphone Hit - The Trolls - $15k + $30k Bonus - 3x Headshot Assassinate - $8,060/min

$15,000 profit
$30,000 Bonus - 3x Headshot Assassinate
Total Profit = $45,000
Total Time = 5 mins 35 sec
$45,000 / 5m 35s = $8,060/min
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Contribute to a total Mission counter in your Agency that increases the amount your Wall Safe will generate per in-game day (48mins RL)
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Call Fraklin to start a Payphone Hit mission.
Or, wait for a RNG spawn of a Payphone to appear in the Open World.