Elmer's new car gives 50% percent better fuel efficiency, measured in kilometers per liter, than his old car. However, his new car uses diesel fuel, which is 20% more expensive per liter than the gasoline his 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?<spanclass=′latex−bold′>(A)</span>20%<spanclass=′latex−bold′>(B)</span>2632%<spanclass=′latex−bold′>(C)</span>2797%<spanclass=′latex−bold′>(D)</span>3331%<spanclass=′latex−bold′>(E)</span>6632%