Final answer:
The person at the top of the chain letter list would receive $36 if each of the six people on the original list sent out six letters and each of the new participants sent $1.
Step-by-step explanation:
The question you've asked is about a chain letter that follows a geometric progression where each person sends out six letters after they add their name to the list. To calculate the total amount of money the person at the top of the list receives, we consider that each of the six people originally on the list sends six letters, thus involving 36 new people in the chain. Since each of these new participants sends $1 to the person at the top of the list, the total amount received by that person would be 36 times $1, which is $36.