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# On 3 sales Tom has received commissions of \$200, \$90, and \$130, and ha

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Math Expert
Joined: 02 Sep 2009
Posts: 49931
On 3 sales Tom has received commissions of \$200, \$90, and \$130, and ha  [#permalink]

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12 May 2017, 05:01
00:00

Difficulty:

25% (medium)

Question Stats:

94% (00:53) correct 6% (00:51) wrong based on 25 sessions

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On 3 sales Tom has received commissions of \$200, \$90, and \$130, and has one additional sale pending. If Tom is to receive an average (arithmetic mean) commission of exactly \$165 on the 4 sales, then the 4th commission must be

A. 75
B. 140
C. 160
D. 200
E. 240

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Location: India
Concentration: General Management, Entrepreneurship
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WE: Engineering (Energy and Utilities)
Re: On 3 sales Tom has received commissions of \$200, \$90, and \$130, and ha  [#permalink]

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12 May 2017, 06:06
Bunuel wrote:
On 3 sales Tom has received commissions of \$200, \$90, and \$130, and has one additional sale pending. If Tom is to receive an average (arithmetic mean) commission of exactly \$165 on the 4 sales, then the 4th commission must be

A. 75
B. 140
C. 160
D. 200
E. 240

Average of the commission received in 1st 3 sales = (200+90+130)/3 = 140
From the 4th sale, we need to increase the average to 165
Difference = 165-140 = 25

So 4th commission should be : 140 + 25 x4 = 240

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Re: On 3 sales Tom has received commissions of \$200, \$90, and \$130, and ha &nbs [#permalink] 12 May 2017, 06:06
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