The contribution margin for October should be considered as the $1,424,500.
Contribution margin = Sales - Cost of goods sold + Total variable selling expense + Total variable administrative expense
= $4,096,400- $2,194,500 + $238,700 + $238,700
= $4,096,400 - $2,671,900
= $1,424,500
Therefore for computing the contribution margin we simply applied the above formula and we have not consider the Total fixed administrative expense as its a fixed expenses.
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