Answer:
The percentage is of 22.5% if the stock price rises to $23 a share.
Explanation:
First you need to calculate the Total Earnings due to increase in price =[1000 *$23]-10000-10000
= $3000
Finally you calculate the Profit percentage(return) = Earnings / total investment + [50% * Earnings / total investment]
= 3000/20000 + 50%*(3000/20000)
= 15% + 7.5%
= 22.5%.