
(a)
The monthly bill for the shop, the marginal cost per kilowatt hour and the average costs per kilowatt hour.

Answer to Problem 13P
The monthly bill of the shop is
The marginal cost of the shop is
The average cost of the shop is
Explanation of Solution
Given:
Load on the machine is
Electricity rates are as follows:
Calculation:
Write the expression to calculate the average cost.
Substitute the value in the above expression.
Write the expression to calculate the monthly bill of the shop.
Substitute the value in the above expression.
Write the expression to calculate the marginal cost.
Substitute,
Conclusion:
The monthly bill of the shop is
The marginal cost of the shop is
The average cost of the shop is
(b)
The cost of additional energy and the cost per kilowatt hour.

Answer to Problem 13P
The cost for additional energy is
The cost per kilowatt hour is
Explanation of Solution
Given:
Additional energy requirement is
Calculation:
Write the expression to calculate the additional energy cost
Substitute,
Write the expression to calculate the cost of additional energy per kilowatt-hour.
Substitute,
Conclusion:
The cost for additional energy is
The cost per kilowatt hour is
(c)
Cost for installing new machines and the cost per kilowatt hour.

Answer to Problem 13P
The cost for installing new machines is
The cost per kilowatt hour is
Explanation of Solution
Given:
Power consumption by new machines is
Calculation:
Write the expression to calculate cost for installing new machines.
Substitute,
Write the expression to calculate the cost of additional energy per kilowatt-hour.
Substitute,
Conclusion:
The cost for installing new machines is
The cost per kilowatt hour is
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Chapter 2 Solutions
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