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Last year the average (arithmetic mean) of monthly cookie sales triple

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Last year the average (arithmetic mean) of monthly cookie sales triple [#permalink]

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New post 09 Jan 2018, 04:32
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C
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E

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Last year the average (arithmetic mean) of monthly cookie sales tripled each quarter from the per month average from the previous quarter. If the average for the first quarter's cookie sales was z, what were the total cookie sales for the year in terms of z?

A. 30z
B. 40z
C. 120z
D. 140z
E. 160z
[Reveal] Spoiler: OA

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Re: Last year the average (arithmetic mean) of monthly cookie sales triple [#permalink]

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New post 09 Jan 2018, 05:03
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First quarter average is z. So sum of first 3 month sales is (m1 +m2 + m3) = 3z. Next quarter monthly sales becomes 3 times earlier quarter. So m4 + m5 + m6 = 3 x 3z is 9z. Similarly quarter 3 sum becomes 27z and last quarter sum becomes 81z. So full year total sales is 3z + 9Z + 27z + 81z = 120z. Answer is C.

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Re: Last year the average (arithmetic mean) of monthly cookie sales triple [#permalink]

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New post 09 Jan 2018, 05:06
Yeah, it's c.
What level question is this...600 or 700??

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Re: Last year the average (arithmetic mean) of monthly cookie sales triple   [#permalink] 09 Jan 2018, 05:06
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Last year the average (arithmetic mean) of monthly cookie sales triple

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