For Machine A
Present worth of annual maint cost = 2000 * [1 - (1+0.05)^15 / (1+0.1)^15] / (0.1 - 0.05)
= 2000 * [1 - (1.05)^15 / (1.1)^15] / (0.05)
= 2000 * 10.046422
= 20092.84
EUAW of machine A = -280000 * (A/P, 10%,15) + 40000 - 20092.84 * (A/P, 10%,15) + 19250 * (A/F, 10%,15)
= -280000 *0.131474 + 40000 - 20092.84 *0.131474 + 19250 *0.031474
= 1151.47
EUAW of machine B = -185000 * (A/P, 10%,10) + 32000 - 1000 - 350 * (A/G, 10%,10) + 14800 * (A/F, 10%,10)
= -185000 *0.162745 + 32000 - 1000 - 350 *3.725461 + 14800 *0.062745
= 516.89
As EUAW of A is more, it should be selected
Pls upload next question separately as HOMEWORKLIB Policy
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