BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

The cost \(C,\) in dollars, to remove \(p\) percent of a certain pollutant from a pond is estimated by using the formula

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 2898
Joined: Thu Sep 07, 2017 2:49 pm
Thanked: 6 times
Followed by:5 members

The cost \(C,\) in dollars, to remove \(p\) percent of a certain pollutant from a pond is estimated by using the formula

by Vincen » Thu Jan 14, 2021 12:22 pm
The cost \(C,\) in dollars, to remove \(p\) percent of a certain pollutant from a pond is estimated by using the formula \(C = \dfrac{100,000p}{100 - p}.\) According to this estimate, how much more would it cost to remove \(90\) percent of the pollutant from the pond than it would cost to remove \(80\) percent of the pollutant?

(A) \(\$500,000\)
(B) \(\$100,000\)
(C) \(\$50,000\)
(D) \(\$10,000\)
(E) \(\$5,000\)

Answer: A

Source: Official Guide
Top
Source: — Problem Solving |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 8088
Joined: Sat Apr 25, 2015 10:56 am
Location: Los Angeles, CA
Thanked: 43 times
Followed by:29 members

Re: The cost \(C,\) in dollars, to remove \(p\) percent of a certain pollutant from a pond is estimated by using the for

by Scott@TargetTestPrep » Wed Jan 20, 2021 2:40 pm
Vincen wrote: ↑
Thu Jan 14, 2021 12:22 pm
 The cost \(C,\) in dollars, to remove \(p\) percent of a certain pollutant from a pond is estimated by using the formula \(C = \dfrac{100,000p}{100 - p}.\) According to this estimate, how much more would it cost to remove \(90\) percent of the pollutant from the pond than it would cost to remove \(80\) percent of the pollutant?

(A) \(\$500,000\)
(B) \(\$100,000\)
(C) \(\$50,000\)
(D) \(\$10,000\)
(E) \(\$5,000\)

Answer: A

Source: Official Guide
Solution:

The cost of removing 90 percent of the pollutant from the pond is C = 100,000(90) / (100 - 90) = 900,000 dollars. Similarly, the cost of removing 80 percent of the pollutant from the pond is C = 100,000(80) / (100 - 80) = 400,000 dollars. Thus, the difference between the costs of removing 90% and 80% of the pollutant from the pond is 900,000 - 400,000 = 500,000 dollars.

Answer: A

Scott Woodbury-Stewart
Founder and CEO
[email protected]

Image

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

ImageImage
Top
Post new topic Post Reply
• Page 1 of 1