Can someone help me understand where I'm going wrong on these please? Please walk me through one

"Gabriella bought a house for $341,000 and paid $65,000 as a down payment. If the interest rate is 9.1% for 15 years, what is the total cost of the house?" "Gabriella bought a house for $625,000 and paid $113,000 as a down payment. If the interest rate is 7.5% for 15 years, what is the total cost of the house?" "Gabriella bought a house for $476,000 and paid $62,000 as a down payment. If the interest rate is 16.7% for 15 years, what is the total cost of the house