Question $6$: A town built on a river is considering building an additional bridge across the river. Two proposals have been put forward for bridges at different sites. The costs of each proposal are summarised as follows:

$\backslash$table$[[,$Bridge A$,$Bridge B$],[$Initial cost of bridge,Rs $6,500,000,$Rs $5,000,000],[$Initial cost of Road works,Rs $3,500,000,$Rs $3,000,000],[\backslash$table$[[$Annual maintenance of$],[$bridge$]],$Rs $50,000,\backslash$table$[[$Rs $90,000$ for first $15$ years$],[$&$1,10,000$ thereafter$]]],[\backslash$table$[[$Annual maintenance of$],[$Roads$]],$Rs $30,000,$Rs $25,000],[$Life of bridge,$60$ years,$30$ years$],[$Life of roads,$60$ years,$30$ years$]]$

With the cost of capital at $9\%,$ which proposal should be adopted? $($Assessment of the proposals to be carried out by a comparison of their present worth$)$