An environmental engineer is considering three methods for disposing of a non-hazardous chemical sludge: land application, fluidized-bed incineration, and private disposal contract. The estimates for each method are below. The MARR is 10 % per year

	Land Application	Incineration	Contract
First cost, $	-150,000	-900,000	0
Annual cost, $/year	-29000	-27000	-170000
Salvage value, $	2000	20000	0
Estimated life, years	4	6	2

Determine which has the least cost on the basis of an present worth

Determine the future worth of each alternative of the present worth calculated in a