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19 July, 06:57

How many monthly payments remain to be paid on an 8% mortgage with a 30-year amortization and monthly payments of $733.76, when the balance reaches one-half of the $100,000 mortgage?

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  1. 19 July, 09:26
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    Approximately 91 payments

    Explanation:

    Target Balance = PV = $100,000 x 1/2 = $50,000

    R = Pi (1 - (1 + i) - n

    733.76 = 50,000 x 0.0067 / (1 - (1 + 0.0067) - n

    733.76 = 335 / (1 - (1 + 0.0067) ^-n

    1 - (1 + 0.0067) ^-n = 335 / 733.76

    1 - (1 + 0.0067) ^-n = 0.45655

    (1 + 0.0067) ^-n = 0.45655 - 1

    - (1 + 0.0067) ^-n = - 0.54345

    (1 + 0.0067) ^-n = 0.54345

    (1.0067) ^n = 1 / 0.54345

    (1.0067) ^n = 1.84010

    n log 1.0067 = log 1.84010

    n = log 1.84010 / log 1.0067

    n = 94.322 = 91 (approximately)
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