Marie decides to buy a house for $85,000. She takes out a 30 year mortgage with a 6.25% rate. What would Marie's interest be if using a simple

Marie decides to buy a house for $85,000. She takes out a 30 year mortgage with a 6.25% rate. What would Marie's interest be if using a simple interest formula?

What would the interest be if she took out a 15 year mortgage with the same rate?