How to solve this?

x= Price of ticket.

Scenario 1: Assume she bought the ticket 60 days prior the conference, because the next day will be 59th and the discount rate will change.

60th day price:- 0.6x=252, which makes x=420. Which makes the 59th day price: 0.7(420)=294. (which does not match the price in question)

Scenario 2: She bought the tickets 30 days prior the conference, so that the next day will be 29th.

30th day :0.7x=252; which makes the real price x= 360.

29th day : 0.85(360)=306 (which matchs the price in the question)

Hence the answer is B) 30 days.

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