Parasite Engineering is developing a new product for the parasitic market that services parasites. The opportunity is estimated to be worth $1.0B measured in todays dollars. The company will need to spend $500M today to begin the research. In five years, the company will have to make a decision as to whether to go into full scale production and begin selling the drug. At that time, the company estimates it will cost $1.5B to move forward. If the appropriate risk-free rate is 2.5%, how high must the annual volatility be to make the project worth beginning?