Need Help with part C, thanks

Question 4 4 pts Theresa Davis is in the 30% personal tax bracket. She is planning to buy $5,000 of HCA (taxable) bonds that offer a 11% interest rate. Please answer the following questions: a) What is Ms. Davis' after tax interest rate on the HCA bonds? b) Mercy Hospital (a not-for-profit corporation) issues tax exempt bonds at an interest rate of 8%. If Ms. Davis buys $5,000 of these bonds, how much interest will she earn? c) What interest rate would HCA have to offer for Ms. Davis to be equally as likely to buy either HCA's or Mercy's bonds (worth $5,000)? 1) Select the link below to open the answer spreadsheet 2) Create or use the required formula or calculation (answers belong in the bordered and highlighted boxes)