28. The value of d1 in the Black Scholes option pricing model is 0.0526 . Calculate the value of N(d1). Round your answer to four decimal places. 29. Based on a normal distribution, what is the probability that a stock remains within 1.6 standard deviations of its current price during the next year? Round your answer to a whole percentage. 30. Assume the S\&P 500 Index began the year at an index level of 3,824 and finished the year at 4,650. Calculate the natural log percent change in the Index for 2023. Round your answer to a whole percentage