Gina is comparing four long distance phone plans. The table shows the cost of each plan. If Gina plans to use less than 500 minu
tes each month, the most cost effective plan is
plan A
plan B
Plan C
Plan D
plan A
plan B
Plan C
Plan D
2 answers:
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Given cost function is
c(x) = (20 ≤ x ≤ 400)
where x is the number of thousands of square feet
total revenue will be $0.2 million dollars per thousand square feet
Revenue is 0.2 millions per thousand square feet. we know x is the number of thousand of square feet
So R(x) = 0.2x
We know Profit = Revenue - Cost
P(x) = R(x) - C(x)
combine like terms
Profit function is