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Nezavi [6.7K]
3 years ago
5

A mining company owns two mines, each of which produces three grades (high, medium, and low) of ore. The company has a contract

to supply a smelting company with at least 12 tons of high- grade ore, at least 8 tons of medium-grade ore, and at least 24 tons of low-grade ore. Each hour of operation, mine 1 produces 6 tons of high- grade ore, 2 tons of medium-grade ore, and 4 tons of low-grade ore. Each hour of operation, mine 2 produces 2 tons of high-grade ore, 2 tons of medium-grade ore, and 12 tons of low-grade ore. It costs $200 per hour to operate mine 1 and $160 per hour to operate mine 2. How many hours should each mine be operated so as to meet the contractual obligations at the lowest total operating cost.
Required:
a. Formulate a linear programming model for this problem.
b. Solve this model by using graphical analysis.

Business
1 answer:
sashaice [31]3 years ago
7 0

Answer:

They should operate Mine 1 for 1 hour and Mine 2 for 3 hours to meet the contractual obligations and minimize cost.

Explanation:

The formulation of the linear programming is:

Objective function:

C=200M_1+160M_2

Restrictions:

- High-grade ore: 6M_1+2M_2\geq12

- Medium-grade ore: 2M_1+2M_2\geq8

- Low-grade ore: 4M_1+12M_2\geq24

- No negative hours: M_1,M_2\geq0

We start graphing the restrictions in a M1-M2 plane.

In the figure attached, we have the feasible region, where all the restrictions are validated, and the four points of intersection of 2 restrictions.

In one of this four points lies the minimum cost.

Graphically, we can graph the cost function over this feasible region, with different cost levels. When the line cost intersects one of the four points with the lowest level of cost, this is the optimum combination.

(NOTE: it is best to start with a low guessing of the cost and going up until it reaches one point in the feasible region).

The solution is for the point (M1=1, M2=3), with a cost of C=$680.

The cost function graph is attached.

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Answer:

(B) False

Explanation:

As we know that

Net income = Total revenues - total expenses

The main difference between the single - step income statement and the multi-step income statement  due to classifications

In the single - step income statement, we normally

Revenues

Total revenues (A)

Expenses

Total expenses (B)

Net income (A-B)

while in multi-step income statement,

Sales revenue

Less: Cost of goods sold

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General and administrative expenses

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Profit before tax

Less: income tax

Net income

So in both the cases, the amount of the net income is equal.

3 0
3 years ago
You lend a friend ​$​, which your friend will repay in equal annual​ end-of-year payments of ​$​, with the first payment to be r
Vadim26 [7]

Answer: 18%

Explanation:

The payments that your friend will make are an annuity as they are constant. This means that the loan amount of $15,000 is the present value of the annuity.

To find the rate of return, use the factor tables.

Present value of annuity = Annuity * Present value interest factor of annuity, 14 years, ?%

15,000 = 3,000 * Present value interest factor of annuity, 14 years, ?%

Present value interest factor of annuity, 14 years, ?% = 15,000 / 3,000

Present value interest factor of annuity, 14 years, ?% = 5.0

Go to the present value of annuity factor table and find out what interest rate intersects with 14 periods such that the factor is 5.0.

That rate is 18%.

Rate of return is therefore 18%.

6 0
2 years ago
According to the video, what do many Accountants and Auditors decide to do?
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3 0
2 years ago
Three years ago, Joe bought a 5-year, 10% coupon paid semiannually bond for $1000. Currently, with interest rates having risen s
ludmilkaskok [199]

Answer:

3.63%

Explanation:

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3 0
2 years ago
On September 3, 2018, the Robers Company exchanged equipment with Phifer Corporation. The facts of the exchange are as follows:
emmasim [6.3K]

Answer:

In Robers Company:

Debit Accumulated depreciation $75,000

Debit Equipment $72,500

Debit Cash $10,000

Credit Equipment $145,000

Credit Gain on exchange asset $12,500

In Phifer Corporation

Debit Accumulated depreciation $83,000

Debit Equipment $82,500

Debit Loss on exchange asset $9,500

Credit Cash $10,000

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Explanation:

In Robers Company:

Book value of the equipment =  $145,000 - $75,000 = $70,000

Fair value of the equipment: $82,500 > Book value

The company will record gain on exchange:

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Debit Equipment $72,500

Debit Cash $10,000

Credit Equipment $145,000

Credit Gain on exchange asset $12,500

In Phifer Corporation

Book value of the equipment =  $165,000 - $83,000 = $82,000

Fair value of the equipment: 72,500 < Book value of the equipment

The company will record loss on exchange:

Debit Accumulated depreciation $83,000

Debit Equipment $82,500

Debit Loss on exchange asset $9,500

Credit Cash $10,000

Credit Equipment $165,000

5 0
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