A home buyer buys a house for $2,357,000. She pays 20% cash, and takes a fixed-rate mortgage for ten years at 8.9% APR. If she makes semi-monthly payments, which of the following is closest to each of her payment? Select one: O a. $11,878.40 b. $13,066.24 O c $14,254.08 O d. $9,502.72 The S&P 500 index delivered a return of 15 %, -15 %, 30 %, and 10 % over four successive years. What is the arithmetic average annual return per year? Select one: ca. 12 % b. 11 % c. 15 % d. 10 %