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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2509
Given Kudos: 1058
GPA: 3.39
The cost per unit of electricity during a 4 year period is as follows:
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15 Nov 2021, 06:29
15 Nov 2021, 06:29
Expert Reply
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Question Stats:
40% (02:05) correct
60% (00:53) wrong based on 5 sessions
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The cost per unit of electricity during a 4 year period is as follows:
Year 1, $1 per unit;
Year 2, $1.5 per unit;
Year 3, $1.2 per unit;
Year 4, $2 per unit.
If a factory spent equal dollars on electricity each year, what was the average cost of a unit of electricity during the 4 year period?
A. $1.333
B. $1.250
C. $1.425
D. $1.175
E. $1.500
Year 1, $1 per unit;
Year 2, $1.5 per unit;
Year 3, $1.2 per unit;
Year 4, $2 per unit.
If a factory spent equal dollars on electricity each year, what was the average cost of a unit of electricity during the 4 year period?
A. $1.333
B. $1.250
C. $1.425
D. $1.175
E. $1.500
Re: The cost per unit of electricity during a 4 year period is as follows:
[#permalink]
19 Nov 2021, 01:14
19 Nov 2021, 01:14
explanation please.
GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2509
Given Kudos: 1058
GPA: 3.39
Re: The cost per unit of electricity during a 4 year period is as follows:
[#permalink]
19 Nov 2021, 01:53
19 Nov 2021, 01:53
1
Expert Reply
Let the company spent $60 each year [LCM of 10, 15, 12, and 20]
Year 1: \(\frac{60}{ 1}\) = 60 units
Year 2: \(\frac{60}{ 1.5}\) = 40 units
Year 3: \(\frac{60}{ 1.2}\) = 50 units
Year 4: \(\frac{60}{ 2}\) = 30 units
Total units: 60 + 40 + 50 + 30 = 180
Total money spent: 60 * 4 = 240
Average: \(\frac{240 }{ 180}\) = \(\frac{4 }{ 3}\) = 1.33
Answer A
Year 1: \(\frac{60}{ 1}\) = 60 units
Year 2: \(\frac{60}{ 1.5}\) = 40 units
Year 3: \(\frac{60}{ 1.2}\) = 50 units
Year 4: \(\frac{60}{ 2}\) = 30 units
Total units: 60 + 40 + 50 + 30 = 180
Total money spent: 60 * 4 = 240
Average: \(\frac{240 }{ 180}\) = \(\frac{4 }{ 3}\) = 1.33
Answer A
