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A company pays project contractors a rate of "a" dollars for the first

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A company pays project contractors a rate of "a" dollars for the first  [#permalink]

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New post 22 Jul 2018, 22:53
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A company pays project contractors a rate of "a" dollars for the first hour and "b" dollars for each additional hour after the first, where a > b.

In a given month, a contractor worked on two different projects that lasted 2 and 4 hours, respectively. The company has the option to pay for each project individually or for all the projects at the end of the month. Which arrangement would be cheaper for the company and how much would the company save?

A) Per month, with savings of $(a + b)
B) Per month, with savings of $(a - b)
C) The two options would cost an equal amount.
D) Per project, with savings of $(a + b)
E) Per project, with savings of $(a - b)

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Re: A company pays project contractors a rate of "a" dollars for the first  [#permalink]

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New post 23 Jul 2018, 01:35
Bunuel wrote:
A company pays project contractors a rate of "a" dollars for the first hour and "b" dollars for each additional hour after the first, where a > b.

In a given month, a contractor worked on two different projects that lasted 2 and 4 hours, respectively. The company has the option to pay for each project individually or for all the projects at the end of the month. Which arrangement would be cheaper for the company and how much would the company save?

A) Per month, with savings of $(a + b)
B) Per month, with savings of $(a - b)
C) The two options would cost an equal amount.
D) Per project, with savings of $(a + b)
E) Per project, with savings of $(a - b)


Clearly per month is better because you have to pay a once for each project, so 2a for two projects..
Whereas if both are paid together, we pay b instead of a..
So savings are a-b
B

Otherwise
Project wise..
2 hrs .....a+b
4 hrs ....a+3b
Total 2a+4b

Month wise
2+4=6.....a+5b
a>b...... so savings 2a+4b-(a+5b)=2a+4b-a-5b=a-b

B
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Re: A company pays project contractors a rate of "a" dollars for the first &nbs [#permalink] 23 Jul 2018, 01:35
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A company pays project contractors a rate of "a" dollars for the first

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