18. A 6-month put has a strike price of $33.50. The underlying stock's price is $31.00. What is intrinsic value of this put? 19. A 6-month call has a strike price of $30. The underlying stock is priced at $31.80 and the option premium on the call is $2.30. What is the per share time value of the call? 20. A 3-month put has a strike price of $47.50 and an option premium of $1.70. The underlying stock is selling for $46.70 per share. What is the time value of the put