Please help me with 15.7-15.8

15-7 Holding all else constant, what effect would the following have on a company's P/E ratio? (highlight answer, delete others) (COME BACK) a. An increase in expected growth rate of earnings. Up Down No change b. A decrease in expected dividend payout ratio. Up Down No change c. An increase in the risk-free rate of return. Up Down No change d. An increase in the risk premium. Up Down No change e. A decrease in the required rate of return. Up Down No change 15-8 Assume that Intel announces a 40% increase in EPS for its most recent quarter, and the stock price immediately declines 15% while the market as a whole remains unchanged. How would you explain this