Final answer:
The total monthly sales for Drexel-Hall stores is $3,600,000. The monthly responsibility margin of Stores 1 and 2 is $102,000 and $126,000 respectively. The company's income from operations is $186,000.
Step-by-step explanation:
The total monthly sales for Drexel-Hall stores can be calculated by adding up the sales of each store. In this case, the total monthly sales would be $1,800,000 + $600,000 + $600,000 + $600,000 = $3,600,000.
The monthly responsibility margin of Stores 1 and 2 can be calculated by subtracting the traceable fixed costs from the contribution margin for each store. For Store 1, the responsibility margin would be $222,000 - $120,000 = $102,000. For Store 2, the responsibility margin would be $228,000 - $102,000 = $126,000.
In this case, the income from operations would be $108,000 + $60,000 + $54,000 - $36,000 = $186,000.