Five years ago I took out a 30-year fixed $300,000 mortgage with
monthly payments and an APR of 8%, compounded monthly. I have made
the normal payments in full, and, this morning, after making a
normally scheduled payment, I are paying off the balance by taking
out a new 30-year fixed mortgage at a lower APR of 6% (with monthly
compounding). How much will each monthly payment be?