How did he get this solution?

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