Answer:
Let's start with Company A. Last year, the stock in Company A was worth $2600. Since it has decreased by 11% of last year's value, we can calculate the decrease by multiplying $2600 by 11% (0.11):
$2600 * 0.11 = $286
So, the stock in Company A has decreased by $286.
Now let's move on to Company B. Last year, the stock in Company B was worth $1400. We know that the decrease in Company A's stock is the same percentage decrease as Company B's stock. Therefore, Company B's stock has also decreased by 11%.
To find the decrease in Company B's stock, we can multiply $1400 by 11% (0.11):
$1400 * 0.11 = $154
So, the stock in Company B has decreased by $154.
To calculate the total percentage decrease, we need to add the decreases in Company A and Company B, which is $286 + $154 = $440.
To express this decrease as a percentage of the total value last year, we can divide the total decrease by the sum of the initial values of the stocks:
$440 / ($2600 + $1400) = $440 / $4000 = 0.11 or 11%
Therefore, the total percentage decrease in the combined value of the stocks is 11%.