To find out how much one concert ticket costs, here's what we did:
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Count the people: Kirsten has 3 friends, so that makes a total of 4 people going to the concert.
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Figure out the insurance cost: Each person needs insurance, and it costs $15. So for 4 people, we calculate: \[ 4 \text{ people} \times 15 \text{ dollars/person} = 60 \text{ dollars} \]
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Find the total ticket cost: The whole trip costs $530, but we need to subtract the insurance cost. So, we do: \[ 530 \text{ dollars (total)} - 60 \text{ dollars (insurance)} = 470 \text{ dollars} \] This $470 is how much we paid for tickets only.
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Calculate how much each ticket costs: Since we bought 4 tickets for $470, we divide that by 4: \[ \frac{470 \text{ dollars}}{4 \text{ tickets}} = 117.5 \text{ dollars/ticket} \]
So, each concert ticket costs $117.50!