In the Amazon level, when you will eventually get to a big gray statue that will offer you a way up if you pay a certain amount of money. Choose "No" and then make Scrooge turn around and walk a little to his left. You should see one of the enemies that throw plungers at you approaching. Place yourself right under the rope that is at the top of the screen. Now, dodge the plumbers that the enemy throws at you, and then use Scrooge's cane to jump off the top of that enemy in order to reach the rope without paying the statue.