2017 AMC 10B Problems/Problem 12

Problem

Elmer's new car gives $50\%$ percent better fuel efficiency. However, the new car uses diesel fuel, which is $20\%$ more expensive per liter than the gasoline the old car used. By what percent will Elmer save money if he uses his new car instead of his old car for a long trip?

$\textbf{(A) } 20\% \qquad \textbf{(B) } 26\tfrac23\% \qquad \textbf{(C) } 27\tfrac79\% \qquad \textbf{(D) } 33\tfrac13\% \qquad \textbf{(E) } 66\tfrac23\%$

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2017 AMC 10B (Problems • Answer Key • Resources)
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2017 AMC 10B Problems/Problem 12

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