please show the steps. preferably with a finance calculator

You took out your home mortgage five years ago, and are currently considering refinancing into a loan at a lower rate and for a shorter term. Your original loan was for 30 years, at 6% interest on the $200,000 borrowed, and you pay monthly. The new loan you are considering will be for 15 years at a rate of 4%. Again, the payments will be monthly. What will your new payment be if you take on this new loan