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July 24, 2014

July 24, 2014

Posted by **Jugrnot** on Monday, January 30, 2012 at 3:26pm.

I have been on this for a couple hours and believe I am only off by a fraction and that is why my digital homework is still saying it is correct. Instead of copying 4 pages of home work and math I will post my large findings in hopes someone can see where I messed up.

Monthly payment of original 30yr mortgage = 1589.11

Total interest to be paid on original 30 yr mortgage = 369161.35

Unpaid balance of original loan after 10 years = 180472.95

Total interet paid during 1st ten years on original 30yr mortgage = 168248.93

New monthly payment for 15 yr mortgage = 1436.59

Total interest to be paid on new 15 year mortgage = 78113.25

Total savings:

369161.35-(168248.93+78113.25)=122799.17

And this answer was wrong???? Standing back from the numbers they all look about right using common sense but online homework thing says its wrong? Any help would be much appreciated

- MATH (REFINANCE MORTGAGE) -
**Reiny**, Monday, January 30, 2012 at 4:02pmYour original payment is correct, I got the same.

Amount owing after 10 years

= 202916.70(1.00725)^120 - 1589.11(1.00725^120 - 1)/.00725

= 180472.95 YEAHH, you had that

new plan: 20 years at .042

i = .042/12 = .0035

WHY ARE YOU TALKING ABOUT A 15 YR MORTGAGE?

Should be 20 years

180472.95 = p (1 - 1.0035^-240)/.0035

p = 1112.74

Think I found your error, take it from here.

- MATH (REFINANCE MORTGAGE) -
**Phil Rewa**, Monday, January 30, 2012 at 5:41pmSHOOT THE ORIFINAL QUESTION IS TO COMPARE A 15 YEAR MORTGAGE AT 5.1% NOT THE 20 YR AT 4.2%. PLEASE TAKE ANOTHER LOOK IF YOU CAN:)

- MATH (REFINANCE MORTGAGE) -
**Reiny**, Monday, January 30, 2012 at 6:06pmOk , I found the new monthly payment for the 15 year, at 5.1% and also got 1436.59

The interest on the original plan would have been

360(1589.11) - 202916.70 = 369161.35

which you got

interest with new plan

= 120(1589.11) + 180(1436.59) - 202916.70

= 190692.68 + 258586.20 - 202916.70

= 246362.18

difference in interest paid

= 369161.35 - 246362.18

= 122799.17

mmmhhh?

- MATH (REFINANCE MORTGAGE) -
**Phil Rewa**, Monday, January 30, 2012 at 6:17pmso your getting the same thing? huh

- MATH (REFINANCE MORTGAGE) -
**Reiny**, Monday, January 30, 2012 at 6:24pmyup!

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