Having heard about IPO underpricing, I put in an order to my broker for 1,160 shares of every IPO he can get for me. After 3 months, my investment record is as follows: a. What is the average underpricing in dollars of this sample of IPOs? (Do not round intermediate calculations. Round your answer to 2 decimal places.) b. What is the average initial return on my "portfolio" of shares purchased from the four IPOs that I bid on? When calculating this average initial return, remember to weight by the amount of money invested in each issue. (Do not round intermediate calculations. Enter your answer as a percent rounded to 1 decimal place.)