Can you solve the $20 riddle? ft SMBC Comics' Zach Weinersmith

Answer to the $20 riddle? The same as the answer to another riddle, which I will share here. The other riddle states that an explorer, out in the jungle, is captured by a band of natives. The chief of the tribe tells the explorer that he will be killed, but before he is, he will be allowed to make one statement, which will determine how he will die. If his statement is true, he will be thrown off a cliff. If his statement is false, he will be eaten by tigers. What can the explorer say as his last statement that will force the tribe to let him go? The answer: "I will be eaten by tigers." This sets up a paradox. If his statement is true, he will be thrown off a cliff, but that will make the statement false, which means he will be eaten by tigers, but that will make the statement true, meaning he'd have to be thrown off a cliff, and so on and so forth. A similar thing will happen here. The professor says "You will give me ten dollars." If the statement is true, then the participant gets to keep both $10 bills, but that makes the statement false, so the student has to give up one of the bills. This, however, makes the statement true, and on it goes until the student now owes the professor $1000. Logical paradoxes. I love them.
Note: Just watched it, and my thought was right, but also wrong. I was right about part of the statement, but I was wrong about how he gets the $1000. His statement is "You will either give me $10 or $1000." This means there is a paradox with giving $10, thus forcing the student to give up $1000.