In exactly the same circumstances as above, you pay the same discount point to bring the 3.00% rate down from 3.20%, on a 30-year mortgage: a) What is the effective rate (APR) of that mortgage? b) Why are the APRs different in question #3 versus #4?

You purchase a $350,000 house and you pay 20% down and the standard 1% origination fee, plus a 1% discount to bring the rate to 3.00% from 3.20% on a 15-year mortgage. What is the effective rate (APR) of the mortgage?

In exactly the same circumstances as above, you pay the same discount point to bring the 3.00% rate down from 3.20%, on a 30-year mortgage: a) What is the effective rate (APR) of that mortgage? b) Why are the APRs different in question #3 versus #4?

my apologies, i posted them separately