John can purchase an airline ticket for $540 now or can pay $578 in 90 days. If interest is 6.6%, determine whether John should purchase the ticket now or in 90 days.

A) Buy now - savings of $28.74
B) Buy now - savings of $34.22
C) No difference between the two options
D) Buy later - savings of $28.74
E) Buy later - savings of $34.22

To determine if John should buy the ticket now or later, calculate the future value of $540 after 90 days at 6.6% annual interest. The formula for future value is FV = PV(1 + r)^n, where PV is the present value, r is the interest rate per period, and n is the number of periods. Here, r = 6.6%/365 = 0.01808% per day (since interest rates are annual), and n = 90 days. FV = $540 * (1 + 0.0001808)^90 ≈ $568.26. Since $578 (cost of buying later) is more than $568.26 (what $540 will be worth in 90 days), John saves by buying now. The savings are $578 - $568.26 = $9.74, but since none of the options exactly match this calculation due to a potential misunderstanding in the calculation process, the closest option indicating savings by buying now is A, acknowledging a discrepancy in the exact savings amount calculated.