http://www.bankrate.com/calculators/mortgages/mortgage-calculator.aspx

 

b)     15-year vs. 30-year mortgage calculator

http://www.bankrate.com/calculators/mortgages/15-year-30-year-mortgage-calculator.aspx

 

c)     Fixed or adjustable rate mortgage?

http://www.bankrate.com/calculators/mortgages/compare-arm-or-fixed-rate-calculator.aspx

 

d)     Mortgage annual percentage rate calculator

http://www.bankrate.com/calculators/mortgages/mortgage-apr-calculator.aspx