Please answer the following question "a" in attachment and use four decimal places for implied volatility and record the answer in Excel, also please show the calculation process.

Your portfolio: A stock is currently trading at 55. You hold a portfolio of the following instruments: 0 Long 200 shares of stock 0 Long 200 puts with a strike of 50 and maturity of three months (T=13/52) 0 Short 200 calls with a strike of 60 and maturity of three months (T=13/52) All of the options are European options and each option is on 1 share. This portfolio information and information on interest rate and dividend are contained in the attached Excel file (rows 1-4). Prices of various options (including the ones held in your portfolio) are listed in the Excel file (see rows 6-12). Requirements: a. Based on the option prices, compute their implied volatility using the Black-Scholes model. Record your answers (in Sheet1) in range D7:D12 (6x0.25=1.5 marks)