Please show step by step solving I've been trying to solve this question $6$ times now. Thankyou

Riley is looking for a fully amortizing $30$ year Fixed Rate Mortgage with monthly payments for $$860,000.$ Mortgage B has a $6\mathrm{.}10\%$ interest rate and requires Riley to pay zero fees upfront. Assuming Riley makes payments for $30$ years, what is Riley$$s annualized IRR from mortgage B$?$ Write your answer as a percent rounded to two decimal points without the $\%$ sign $($e$.$g$.$ if you get $5\mathrm{.}6499\%,$ write $5\mathrm{.}65)$

Ann is looking for a fully amortizing $30$ year Fixed Rate Mortgage with monthly payments for $$4,500,000.$ Mortgage A has a $4\mathrm{.}38\%$ interest rate and requires Ann to pay $1\mathrm{.}5$ points upfront. Mortgage B has a $6\%$ interest rate and requires Ann to pay zero fees upfront. Assuming Ann makes payments for six months before she sells the house and pays the bank the balance, what is Ann$$s annualized IRR from mortgage A$?$ Write your answer as a percent rounded to two decimal points without the $\%$ sign $($e$.$g$.$ if you get $5\mathrm{.}6499\%,$ write $5\mathrm{.}65).$

Ann is looking for a fully amortizing $30$ year Fixed Rate Mortgage with monthly payments for $$4,500,000.$ Mortgage B has a $8\mathrm{.}0\%$ interest rate and requires Ann to pay zero fees upfront. Assuming Ann makes payments for $2$ years before she sells the house and pays the bank the balance, what is Ann$$s annualized IRR from mortgage B$?$ Write your answer as a percent rounded to two decimal points without the $\%$ sign $($e$.$g$.$ if you get $5\mathrm{.}6499\%,$ write $5\mathrm{.}65).$