Answer:
21.64%
Step-by-step explanation:
First you would want to take the total cost of buying the stock and add it up.
1000+2000+15+150=3165
After this you would take the price at which it was sold ($3850) and subtract 3165 from it.
3850-3165=685
$685 is the total profit.
Finally you would take the total profit and divide it by the total cost.
685/3165=0.2164297
This gives you the final Rates of Return of 21.64%