Six years after buying 100 shares of xyz stock for $40 per share you sell the stock for 6400.

6400-4000/4000=0.6
6400/4000=1.6
yx exponent in parentheses
(1/4)=1.12468265
-1=0.12468265
=12.5

What is the problem you're trying to solve?

To calculate the profit percentage from selling the XYZ stocks, follow these steps:

Step 1: Determine the initial cost of the shares.
The initial cost of buying 100 shares of XYZ stock at $40 per share is:
100 shares * $40 per share = $4000

Step 2: Calculate the profit made from selling the shares.
The amount received from selling the shares is $6400.
Profit = Amount received - Initial cost = $6400 - $4000 = $2400

Step 3: Calculate the profit percentage.
Profit Percentage = (Profit / Initial cost) * 100%
Profit Percentage = ($2400 / $4000) * 100%
Profit Percentage = 0.6 * 100%
Profit Percentage = 60%

Therefore, the profit percentage from selling the XYZ stocks is 60%.

To calculate the rate of return for the XYZ stock, you can use the formula:

Rate of Return = (Final Value - Initial Value) / Initial Value

In this case, the initial value is the cost of buying 100 shares of XYZ stock for $40 per share, which is 100 * $40 = $4000. The final value is the amount you sell the stock for, which is $6400.

Substituting these values into the formula:

Rate of Return = ($6400 - $4000) / $4000

= $2400 / $4000

= 0.6

So, the rate of return for the XYZ stock is 0.6, or 60%.

It seems like the steps you followed in your explanation are not clear or correct. If you explain the methodology you used, I can provide a more accurate explanation.