To find the cost of one ticket to the concert, we first need to determine the total amount spent on insurance and how much was left for the concert tickets.
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Calculate the total insurance cost for Oksana and her three friends:
- There are 4 people (Oksana + 3 friends).
- Insurance per person = $15
- Total insurance = 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 cost after insurance = $540 - $60 = $480
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Now, divide the total cost after insurance by the number of tickets (4):
- Cost per ticket = $480 / 4 = $120
Thus, the cost of one ticket to the concert was $120.