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12th grade calculus

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your operate a tour service that offers the following rate:

$200 per person if 50 people (the minimum number to book the tour) go on the tour

for each additional person, up to a maximum of 80 people total, the rate per person is reduced by $2

it cost $6000 (a fixed cost) plus $32 per person to conduct the tour. how many people does it take to maximize your profit?

  • 12th grade calculus -

    Let x be the number on the tour

    Profit = Revenue - Cost
    x[200 - 2(x-50)] - 6000 - 32x
    50 > x > 80

    For maximum profit,
    dP/dx = 200 - 4x + 100 -32 = 0
    4x = 268
    x = 67

  • 12th grade calculus -

    Let x be the number on the tour

    Profit = Revenue - Cost
    x[200 - 2(x-50)] - (6000 + 32x)

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