## Answers

Computation of PW of Ussed System |

Expected Use of Old Machine (Number of months) = 5 x 12 = 60 Month |

Monthly Labor cost for used system ($40 x 8 Hours x 20 Day Per Month) = $6,400 |

PW, Used system ($) = 75,000 + 6400 x PVIFA(1%, 60) - 20,000 x PVIF(1%, 60) |

=75000+6400*44.955-20000*0.55045= $351703 |

Computation of PW of New System |

Monthly Labor cost for New system ($40 x 8 Hours*0.75 x 20 Day Per Month) = $4800 |

PW, New system ($) = 140,000 + 4,800 x PVIFA(1%, 60) - 60,000 x PVIF(1%, 60) |

=140,000 + 4,800 x 44.955 - 60,000 x 0.55045 = $322757 |

Difference in PW= $351703-322757= $28946 |

Since PW of New System is less than old system, hence its advisable to replace the old machine |

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