PLEASE ANSWER THESE QUESTIONS ASAP! THANKS

Suppose you are trying to calculate the implied volatility from a call option using an iterative procedure. The call option has a strike price of S12 and expires in 1 year. The underlying stock has a price ofS13. The risk-free rate is 10%. The actual call price (the market price) is S2.50. Suppose your initial volatility "guess" is 40%, which gives N(di) 0.7422 and N(dz) 0.5987. Is the implied volatility: a. less than 40% b. greater than 40% c. not enough information to tell