I am comparing a 30 year fixed rate mortgage to a 15 year fixed rate mortgage?

I am comparing a 30 year mortgage with an APR of 4.625% to a 15-year mortgage with a rate of 3.6%. I will pay 9,126 or ,390 in interest, respectively. The difference in payments is 8 per month. I calculated the future value of the 8 per month invested at 5% for 30 years and [...] http://bit.ly/noGGI5