To find the cost of one ticket to the concert, we first need to determine how much they paid in total for the tickets alone, excluding the insurance.
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Calculate the total insurance cost for the four people:
- There are 4 people (Oksana and her 3 friends).
- Each person paid $15 for insurance.
Total insurance cost = 4 people × $15/person = $60.
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Subtract the total insurance cost from the total amount paid for tickets:
- Total amount paid for tickets = $540.
- Total insurance cost = $60.
Total cost of tickets = $540 - $60 = $480.
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Now, divide the total cost of the tickets by the number of people to find the cost of one ticket:
- Total cost of tickets = $480.
- There are 4 people.
Cost of one ticket = $480 ÷ 4 = $120.
Therefore, the cost for one ticket to the concert was $120.