Final answer:
The average value of the three stocks (Stock A, Stock B, and Stock C) is $346.08.
Step-by-step explanation:
To find the average value of the stocks, we need to add up the values of all the stocks and then divide by the number of stocks. In this case, since we have three stocks (Stock A, Stock B, and Stock C), we will add up the values of those stocks and then divide by 3.
Stock A: $420.15
Stock B: $518.38
Stock C: $99.70
Adding up the values: $420.15 + $518.38 + $99.70 = $1038.23
Dividing by 3: $1038.23 / 3 = $346.08
Therefore, the average value of the stocks is $346.08.