How did he get this solution?

19. Speculate with call options on IBM. Buy a call for $5 / share premium with a strike s100 If the price goes to $115 and you exercise, what is the net profit on your contract? a) None b) $15 c) $150 d) $1,500 e) $10 f) $100 g) $1,000 a) Cannot calculate b) None of the above