Skip to Main Content

Source: Official Guide for GMAT Review 2016 Problem Solving; #82

▲

5

The cost C, in dollars, to remove p

The cost C, in dollars, to remove p percent of a certain pollutant from a pond is estimated by using the formula C = 100000p/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?

1 Explanation

▲

1

Shantanu Mukherjee

Cost to remove 90% - Cost to remove 80%
= 100,000*90/(100 - 90) - 100,000*80/(100 - 80)
= 9*100,000 - 4*100,000
= 5*100,000
=500,000

Mar 23, 2017 • Comment

Add Your Explanation

You must have a Magoosh account in order to leave an explanation.

Learn More About Magoosh

Official GMAT Material

Official Guide for GMAT Review 2016

Official Guide for the GMAT 13th Ed.

Official Guide for the GMAT 2015 14th Ed.

Nova's GRE Prep

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.

Section 5.3 Problem Solving

Improve Your Score

Magoosh GMAT is an affordable online course for studying the GMAT.

Learn More About Magoosh

Share Post

Return to Forum