Let's break down the problem step by step.
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Oksana and her three friends mean there are 4 people in total.
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Each person paid $15 for insurance, so the total cost for insurance can be calculated as follows: \[ \text{Total insurance cost} = 4 \text{ people} \times 15 \text{ dollars/person} = 60 \text{ dollars} \]
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The total amount paid for the tickets, including insurance, was $540.
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To find the total cost of the tickets, we subtract the total insurance cost from the total amount paid: \[ \text{Total ticket cost} = 540 \text{ dollars} - 60 \text{ dollars} = 480 \text{ dollars} \]
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Since there are 4 tickets (one for each person), we can find the cost of one ticket by dividing the total ticket cost by the number of tickets: \[ \text{Cost per ticket} = \frac{480 \text{ dollars}}{4 \text{ tickets}} = 120 \text{ dollars} \]
Therefore, the cost for one ticket to the concert was $120.