Oppenheimer Bank is offering a 30-year mortgage with an APY (or effective annual rate) of 6.625%. If you plan to borrow $180,000, what will your monthly payment be?
Effective annual rate = (1 + monthly rate)^n - 1
0.06625 = (1 + monthly rate)^12 - 1
1.06625 = (1 + monthly rate)^12
1.00536 = 1 + monthly rate
Monthly rate = 0.00536 or 0.536%
Number of periods = 30 * 12 = 360
Present value = Monthly payments * [1 - 1 / (1 + rate)^time] / rate
180,000 = Monthly payments * [1 - 1 / (1 + 0.00536 )^360] / 0.00536
180,000 = Monthly payments * [1 - 0.145956] / 0.00536
180,000 = Monthly payments * 159.336486
Monthly payments = $1,129.68
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