The below table shows the list of prices for puts expiring in 30 days (T = 1/12). Using the put option with a strike price of $235, estimate the level of the VIX index. K p 230 2.14 231 2.37 232 2.62 233 2.91 234 3.23 235 3.60 236 4.01 237 4.47 238 4.95 Other parameters you'll need: s0 = $234.35 r = 0.74% T = 1/12 years (required precision 0.01 +/- 0.01)