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.
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Subtract the total insurance cost from the total amount paid: The total amount paid for tickets and insurance is $540.
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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.
Thus, the cost for one ticket to the concert was $120.