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

4

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

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