Based on the amount that Adrian borrowed and the annual interest, his monthly mortgage payment would be $809.39.
The monthly payment is an annuity because it will be constant so we can use the present value of an annuity formula.
Periods:
= 30 x 12
= 360 months
Interest:
= 6% / 12 months
= 0.5%
Monthly amount is:
135,000 = Amount x (1 - (1 + 0.5%)⁻³⁶⁰) / 0.5%
Amount = 135,000 / 166.791614392335294
= $809.39
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