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Post subject: GMAT Percentage Posted: Wed Jan 12, 2011 3:13 pm 

Joined: Sun May 30, 2010 3:15 am Posts: 424

Each customer of a networking company subscribes to one of two plans: Plan A or Plan B. Plan A costs $75 per month and Plan B costs $175 per month per customer. If the company’s average revenue per customer per month is $100, then what percent of the company's revenue comes from customers with Plan A?
A. 25% B. 30% C. 37.5% D. 56.25% E. 75%
(D) This is a tricky weighted average problem. If there are only two price levels, $75 and $175, and the average customer pays $100, then the number of customers who pay $75 must be 3 times the number of customers who pay $175, since $100 is 3 times as close to $75 as it is to $175.
We can show this algebraically: If there are A customers with plan A, and B customers with plan B, then the total revenue is $75A + $175B. Since the average customer pays $100, we know that $100 = ($75A + $175B) / (A + B) $100(A + B) = ($75A + $175B) $100A + $100B = $75A + $175B $25A = $75B A = 3B.
Since there are 3 times as many $75 clients as $175 clients, for every $175 received from Plan B customers, 3($75) = $225 is received from Plan A customers, and the percent of revenue from customers with Plan A is: $225/($225 + $175) = $225/$400 = 56.25%.
The correct answer is choice (D).  Could anyone explain this in more detail.... I do not understand why there are 3 times as many $75 clients as $175 clients.


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Gennadiy

Post subject: Re: GMAT Percentage Posted: Wed Jan 12, 2011 3:28 pm 

Joined: Sun May 30, 2010 2:23 am Posts: 498

The algebraic explanation provided above is the most detailed and sufficient. I suggest, you go through it again, line by line:
If there are x customers with plan A, and y customers with plan B, then the total revenue is $75x + $175y. Since the average customer pays $100, we know that $100 = ($75x + $175y) / (x + y) $100(x + y) = ($75x + $175y) $100x + $100y = $75x + $175y $25x = $75y x = 3y.
So there are 3 times as many $75 clients as $175 clients.
If there is some specific line you do not understand  let me know which one.


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