Waves on a String: Transverse waves travel at $43\mathrm{.}2$ m$/$s in a string that is subjected to a tension of $60\mathrm{.}5$ N$.$ If the string is $15\mathrm{.}9$ m long, what is its mass?

$0\mathrm{.}597$ kg$0\mathrm{.}366$ kg$0\mathrm{.}216$ kg$0\mathrm{.}515$ kg