To find the cost of one ticket to the concert, we first need to determine how much money was spent on the tickets alone, excluding the insurance.
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Calculate the total insurance cost: Since there are four people (Oksana and her three friends), and each person paid $15 for insurance, the total insurance cost is: \[ \text{Total Insurance} = 4 \times 15 = 60 \text{ dollars} \]
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Determine the total amount spent on tickets: Now, we can find out how much was spent on tickets by subtracting the total insurance cost from the total amount paid: \[ \text{Total for Tickets} = \text{Total Amount Paid} - \text{Total Insurance} = 540 - 60 = 480 \text{ dollars} \]
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Calculate the cost of one ticket: Since there are four people, we divide the total amount spent on tickets by the number of people: \[ \text{Cost per Ticket} = \frac{\text{Total for Tickets}}{4} = \frac{480}{4} = 120 \text{ dollars} \]
Thus, the cost of one ticket to the concert was $120.