Krusty Burger stock is selling for $77 per share. Calls with an exercise price of $70 are available on Krusty Burger. The risk risk-free rate is 4%. The time to maturity of the calls is 8 months (i.e., t = 2/3). The volatility of Krusty Burgers stock returns is 50% (i.e., = .50). What is the delta of this call on Krusty Burger?.