Answer: Let's first calculate the increase in value for each stock:
The stock in Company A increased by 5%, which is 0.05 x $580 = $29.
The stock in Company B increased by 18%, which is 0.18 x $5950 = $1071.
The total increase in the investor's stock account is the sum of the individual increases, which is $29 + $1071 = $1100.
To find the percentage increase, we need to divide the total increase by the initial value of the account, which is $580 + $5950 = $6530:
percentage increase = (total increase / initial value) x 100%
percentage increase = ($1100 / $6530) x 100%
percentage increase ≈ 16.8%
Rounding to the nearest tenth, the total percentage increase in the investor's stock account is approximately 16.8%.
Explanation: