The cash flows for three mutually exclusive alternatives are given in table below. MARR $=4\%.$

$\backslash$table$[[,$Alt. A$,$Alt. B$,$Alt. C$],[$Initial cost$,$$$15,000,27,000,24,000],[$Annual benefits,$$4,500,7,600,6,500],[$RoR$,15\%,13\%,11\%$