Answer:
1. $4,200
2. $8,000
3. $3,800 profit
4. 90.48%
Explanation:
QUESTION 1:
The cost of one share two years ago was $105. Since you bought 40 shares, you would have to multiply that price by 40:

That means the total cost of purchasing 40 shares two years ago was $4,200.
QUESTION 2:
One share currently costs $200. Just like with problem 1, since they're asking about all 40 shares, you need to multiply that price by 40.

That means that 40 shares is currently valued at $8,000.
QUESTION 3:
Profit or loss is calculated by subtracting the final value by the initial value. In this case, subtracting the current price by the price you originally bought the shares for.

Because it's a positive number, you know that you've made a profit of $3,800 off of 40 shares.
QUESTION 4:
Rate of return is calculated by dividing the profit (or loss) by the original cost:

Of course, since rate of return is expressed in a percentage, you would need to multiply 0.9048 by 100 and tack a percent sign onto the end, giving you 90.48%. (I rounded the number to the nearest hundredth.)