This is a total amount earned. If you wish you can boost this with a friend by making extremely easy contracts for one another to gain money quickly. You can also earn money on the tutorial. You cannot keep replaying the same contract to gain money. You can also play some through quickplay. Just remember, not everyone wants to make it easy on you. An easy contract is to play on Chinatown. As soon as you exit the doors, mark the 2 chefs. Use Point Shooting and exit to the door on the right. This can take under a minute to complete and earns you well over $100,000.