Ask for money from a loan shark (any amount)
Drop the money in a box in the office
Go up to him and ask for more.
Keep on doing this till you have the amount you need.

Hint: He may say that he 'has ways of getting the money back again', but it never happens!
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Ding Dong Ditch:
Select action when you have chosen a door to go to (any one will do).....
Knock on the door, you will be able to beat a fast track outta there!