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Unformatted text preview: Introduction to derivatives, Fall 2011 BUSI 588, Homework 4 solutions Solutions to Homework 4 1. (*) See hw4.xls for details on the calculations. (a) Using the BlackScholes formula (including dividends) one can back out the value for the volatility from the expression 76 = C (1313 . 5 , 1350 , . 05 , . 02 , 1 , ) either by trialanderror, bisection, or using solver. My calculations suggest = 14 . 62%. (b) Using the previuosly calculated implied volatility in our BlackScholes formula we get that the price of the put should be P = 51 . 41. 2. (*) The following table presents the values of the deltas and gammas for the call options under consideration. Strike 90.0 100 110 Delta 0.7708 0.6256 0.4756 Gamma 0.0121 0.0152 0.0159 A position that is long thirty calls with a strike of $100 and ten puts with a strike of $90 has a of = 30(0 . 6256) + 10(0 . 7708 1) = 16 . 48 and a of = 30(0 . 0152) + 10(0 . 0121) = 0 . 5760 (a) Let n c denote the number of calls we need to buy in order to have a deltaneutral position. We would like for n c to solve n c . 7708 + 16 . 48 = 0 or n c = 21 . 37. The of the combined position would be = 21 . 37(0 . 0121) + 0 . 5760 = 0 . 3169 (b) Let n i denote the number of calls with a strike of 90 and n o denote hte number of calls with a strike of 110 (for inthemoney and outofthemoney). We would like to choose n i and n o so that n i . 7708 + n o . 4756 + 16 . 48 = 0 n i . 0121 + n o . 0159 + 0 . 5760 = 0 My calculations suggest that n i = 1 . 7753 and n o = 37 . 52 make the portfolio delta and gammaneutral....
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This note was uploaded on 11/25/2011 for the course BUSI 588 taught by Professor Staff during the Fall '10 term at UNC.
 Fall '10
 Staff
 Derivatives, Dividends, Volatility

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