Ann is looking for a fully amortizing 30-year Fixed Rate Mortgage with monthly payments for $1,250,000. Mortgage A has a 4.38% interest rate and requires Ann to pay 1.5 points upfront. Mortgage B does not require to pay any fees upfront. Assuming Ann plans to make payments for 2 years and then immediately pay the remaining balance, what should be the interest rate on mortgage B to make Ann indifferent between these two mortgages