For Alphabet (GOOG), use strike prices of 1050, Use the options with April 20, 2018 expiration date for all computations, Assume dividends are zero and the risk-free interest rate is 2% in all computations . Compute the implied volatilities for puts and calls using mid price data: mid price is the average of the bid and ask prices.

GOOG Options: Composite Calls & Puts Near the Money Type: Monthly Go Mar 18 Apr 18 | May 18 | Jun 18 | Aug 18 | Sep 18 | Jan 19 | Jun 19 | Jan 20 |Near Term | All Option Chain for Alphabet Inc. (GOOG) Last Chg Bid Ask Vol Open Root Strike Puts Last Chg Bid Ask Vol pen Calls Int Apr 20 125.99 15.74 119.10 127.50 2 248 GOOG 1050 4.00 -0.80 4.10 5.10 16 1177 2018 Apr 20 122.00 20.00 116.20 121.90 2 90 GOOG 1055 A 4.30 -0.70 4.50 5.60 10 2018 Apr 20 120.00 13.78 111.50 116.90 1 1322 GOOG 1060 5.10 -0.46 4.90 6.10 16 80 2018 2018 Apr 20 Apr 20 107.60 112.30 0 140 GOOG 1065 4.65 -3.18 5.30 6.50 4 93 2018 84.00 105.20 7.20 100.70 108.10 1 63 GOOG 1070 6.10 -0.50 5.70 7.20 65 103 2018 Apr 20 5.73 1.56 6.30 7.80 3 104 103.95 14.88 97.70 103.40 2 164 GOOG 1075 2018 Apr 20 100.00 10.00 93.30 99.40 3 143 GOOG 1080 6.70 3.40 7.00 7.80 16 104 2018