To find the cost of one ticket to the concert, we first need to determine how much was paid for just the tickets themselves, excluding the insurance cost.
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Calculate the total insurance cost: Oksana and her three friends make a total of 4 people. The insurance cost is $15 per person. \[ \text{Total insurance cost} = 4 \text{ people} \times 15 \text{ dollars/person} = 60 \text{ dollars} \]
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Subtract the total insurance cost from the total amount paid: The total amount paid for tickets and insurance is $540. \[ \text{Total cost for tickets} = 540 \text{ dollars} - 60 \text{ dollars} = 480 \text{ dollars} \]
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Calculate the cost of one ticket: Since the total cost for tickets is $480 and there are 4 people, we divide this amount by 4. \[ \text{Cost of one ticket} = \frac{480 \text{ dollars}}{4 \text{ people}} = 120 \text{ dollars} \]
Thus, the cost for one ticket to the concert was $120.