Answer:
1. Profit on stock transaction = 1400
2. percentage return on investment = 11.57
Step-by-step explanation:
stock's purchase price = 12,100
stock's selling price = 13,500
profit = stock's selling price - stock's purchase price
     = 13,500 - 12,100
     = 1,400
For, percentage return on investment;
⇒ percentage return = [tex](\frac{profit}{purchase price })100[/tex]
                  = [tex](\frac{1400}{12100})100[/tex]
                  = [tex]11.57[/tex]