If nation x decides to build 900 miles of highways, how many aircraft carriers can it built

Building a 4 lane highway costs between $4,000,000 and $10,000,000 per mile depending on where it runs (rural, suburban or urban areas). So the country has at least (900 * $4,000,000 =) $2,800,000,000 and at most (900 * $10,000,000 =) $9,000,000,000 available for construction. An aircraft carrier costs about $13,000,000,000, so the country would not be able to afford an aircraft carrier instead of the 900 miles of highways.

On april 20, 1814, the dethroned emperor left france for the isle of  elba, where he was exiled under the terms of the treaty of fontainebleau.napoleon  would be allowed to ruleelba, which had 12,000 inhabitants. perhaps cruelly, the treaty allowed him to retain the title "emperor."