Barney borrows $420,000 at 10% annual interest towards the purchase of a bar. He will pay back the loan with equal annual payments for 10 years. a.) It is not 10 years later. Barney slls the bar to Homer. Assume that Barney paid $600,000 for the bar and Homer just purchased it for $1,200,000. what rate of return did Barney earn on his investment over the 10 years