2. A steam generator is needed in the design of a new power plant. This generator can be fired by three different fuels, A, B or C, with the following cost shown in Table 6-2. If the study period is 20 years and MARR is 8% per year, which type of the fuel is most economical?

Table 6-2

	Alternative A	Alternative B	Alternative C
Installed investment	$30,000	$55,000	$180,000
Annual fuel expense	$97,500	$20,000	$5,000
Useful life (years)	20	20	20