Three independent projects are being considered. None of the projects have any worth at the end of their useful life. Assuming an interest rate of $8\%$ per year, which project, if any, should be built given an infinite budget?

Project A Project B Project C

First cost, $ $-$$$2\mathrm{.}5$M $-$$$5$M $-$$$3$M

Annual maintenance, $$/$year $-$$$15,000-$$$10,000-$$$40,000$

Annual revenue, $$/$year $$400,000$ $$575,000$ $$350,000$

Life, year $101520$