for additional 30 years , the owner should pay $785.19 per month
then 40 years for the interests , the owner should pay 223726.832. compare with 30 years ($203174.216), I THOUGHT THE REFINANCE OPTION IS WORTHWHILE BECAUSE IT IS NOT A BIG DIFFERENCE IN THE INTERESTS BUT EXTRA 10 YEARS COULD BE CONTINUED AND EVERYMONTH PAY LESS THEN THE 30 YEARS . SO I WILL CHOOSE REFINANCE OPTION.
The $12,000 is not part of the principal sum for the refinance option, but that is besides the point. You gave the $12,000 the wrong sign, making your monthly payment smaller than expected. Be sure to include an introduction to the problem at the top of your document. What are you trying to solve? 9/10