Black scholes

The problem with black scholes John is that due to a couple of points difference the value of entire call option changes. What will the markers do with that? I subtracted the pv of dividend from share price. My pv of dividend was 23.8, theirs was 23.58 because of discount factor rounding. Value of my call option is 91.7 cents, their call option is 150.23 cents. this is such a massive difference!