A Stock Is Currently Trading at $100 $u = 1.10$ Or Fall by a Factor Of

Multiple Choice

A stock is currently trading at $100.In each month,the stock will either increase in price by a factor of $u = 1.10$ or fall by a factor of $d = 0.90$ .The risk-free rate of interest per month is 0.1668% in simple terms,i.e. ,an investment of $1 at the risk-free rate returns $1.001668 after one month.What is the early-exercise premium of a 100-strike,six-month American put option?

A) $0.15
B) $0.17
C) $0.89
D) $1.12