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Last Updated on May 10, 2023
GMAT OFFICIAL GUIDE PS
Solution:
The cost to remove 90 percent of the pollutant is determined by letting p = 90 in the cost formula:
100,000(90)/(100 – 90) = 9,000,000/10 = 900,000
Similarly, the cost to remove 80 percent of the pollutant is determined by letting p = 80 in the cost formula:
100,000(80)/(100 – 80) = 8,000,000/20 = 400,000
To determine how much more it costs to remove 90 percent of the pollutant than 80 percent of the pollutant, we calculate the difference of the two costs:
900,000 – 400,000 = 500,000
Answer: A
