Math Problem Statement
Boni memperhitungkan untuk membangun x buah rumah tipe 36, dibutuhkan biaya untuk lahan dan material sebesar b(x) = 250x +30 (dalam juta rupiah) sedangkan biaya untuk tenaga (tukang) sebesar t(x) = 100x + 20 (dalam juta rupiah). Jika penjualan dari x rumah adalah f(x) = 425x - 10 (dalam juta rupiah), maka keuntungan yang diperoleh adalah ... (dalam juta rupiah).
A. u(x) = 75x - 60
B. u(x) = 75x + 40
C. u(x) = 75x - 40
D. u(x) = 75x
E. u(x) = 40 - 75x
Solution
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Math Problem Analysis
Mathematical Concepts
Algebra
Linear Equations
Profit Calculation
Formulas
Total cost: C(x) = b(x) + t(x) = (250x + 30) + (100x + 20)
Revenue: f(x) = 425x - 10
Profit: u(x) = f(x) - C(x) = (425x - 10) - (350x + 50)
Theorems
Basic profit formula: Profit = Revenue - Cost
Suitable Grade Level
Grades 10-12
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