A $240,000 home mortgage for 30 years at a 3.725% interest rate has a monthly payment of $1108. The models for the amount paid toward interest u and the amount paid towards the reduction in principle v are below: u = M - (M - Pr/12)(1 + r/12)12t and v = (M-Pr/12)(1+r/12)12t given P is the amount invested in the mortgage. M is the monthly payment, r is the interest rate and t is the time in years, Determine the time (to the nearest tenth of a year) when the amount paid toward interest is the same as the amount paid toward the reduction principle.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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A $240,000 home mortgage for 30 years at a 3.725% interest rate has a monthly payment of $1108. The models for the amount paid toward interest u and the amount paid towards the reduction in principle v are below:

u = M - (M - Pr/12)(1 + r/12)12t and v = (M-Pr/12)(1+r/12)12t

given P is the amount invested in the mortgage. M is the monthly payment, r is the interest rate and t is the time in years, Determine the time (to the nearest tenth of a year) when the amount paid toward interest is the same as the amount paid toward the reduction principle.

Expert Solution
Step 1

Given that,

  • The amount invested in the mortgage is, P=240000 dollars.
  • Monthly payment is, M=1108 dollars.
  • The rate of interest, r=3.725100.

The model for the amount paid toward interest is given by,

u=M-M-Pr121+r1212t

The model for the amount paid towards the reduction in principle is given by,

v=M-Pr121+r1212t

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