Before 1981, customers visiting Disneyland purchased "ticket books" and paid for each attraction individually. On June 20, 1981, Disneyland began offering an "all-inclusive pass" that allowed guests unlimited use of all attractions. Micah is planning a trip to Disneyland and has an inverse demand curve of P = 6 - 0.2Q (or Q = 30 - 5P), where Q is the quantity of attractions and P is the price per attraction.

Given Micha's demand curve, what is the most Micah would be willing to pay for Disneyland's "all-inclusive pass" that allows for unlimited use of all attractions? (That is, the "all-inclusive pass" is a fixed fee and all individual attractions are free.)

Group of answer choices

$15

$30

$90

$180

None of the above answers are correct.