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cost are given in the table

An engineer is analyzing three different devices that can save 10% of the yearly energy consumption for a nuclear power plant. The devices respective costs and useful lives are given in the following table: Answer the following questions assuming that Devices Y and Z can be replaced with identical replacements at the end of their useful lives and the interest rate is 10%. 1. If annual worth (or cash flow) analysis (AWA) is performed to determine the best alternative, the analysis period for Device X should be (a) Infinity (b) 15 (c) 10 (d) 30 2. The equivalent uniform annual cost (EUAC) of Device X is (a) $1,996 (b) $1,367 (c) $1,543 (d) $2,167 3. The equivalent uniform annual cost (EUAC) of Device Y is (a) \$1,996 (b) $1,367 (c) $1,543 (d) $2,167 4. The equivalent uniform annual cost (EUAC) of Device Z is (a) $1,996 (b) $1,367 (c) $1,543 (d) $2,167 5. If present worth analysis (PWA) is performed to determine the best altemative, the analysis period for Device X should be (a) Infinity (b) 15 (c) 10 (d) 30 6. The net present cost (NPC) of Device X is (a) $19,966 (b) $13,667 (c) $15,433 (d) $21,677 7. The net present cost (NPC) of Device Y is (a) $19,966 (b) $13,667 (c) $15,433 (d) $21,677 The net present cost (NPC) of Device Z is (a) $19,966 (b) $13,667 (c) $15,433 (d) $21,677