What is the exercise price of put at the beginning of the month and what is the monthly payouts on puts?

Problem 20.14 Monthly Values of the S&P 500 Index, October 1977-October 1987 Exercise price of put at the Monthly Payouts Date Open Clase beginning of on Purs Od 87 21.83 251.79 Sep 8732981 321.03 Aug-07 318 62 Jul.87 303.99 31866 87 280.12 304 May 7 290.1 Apr 37 291.59 20 30 Man 07 284.17 291.2 Feb-T 274.00 Jan 7 242.17 274.00 Dec 06 24217 Now 86 243.57 00:36 2430 Sto 25250 24604 250.64 247.25 2309 211. 2018 215 28 DES20211 100 S&P 5 DA Problem 20.14 Monthly Values of the S&P 500 Index, October 1977-October 1987 Exercise price of put at the Monthly Payouts Date Open Clase beginning of on Purs Od 87 21.83 251.79 Sep 8732981 321.03 Aug-07 318 62 Jul.87 303.99 31866 87 280.12 304 May 7 290.1 Apr 37 291.59 20 30 Man 07 284.17 291.2 Feb-T 274.00 Jan 7 242.17 274.00 Dec 06 24217 Now 86 243.57 00:36 2430 Sto 25250 24604 250.64 247.25 2309 211. 2018 215 28 DES20211 100 S&P 5 DA