Answer:
Department 1 is 20%
Department 2 is 52.5%
Department 3 is 35.7%
Step-by-step explanation:
Each department's contribution to overhead as a percentage of sales can be computed by dividing each department's contribution by sales value in each department as follows:
contribution=sales-costs of goods sold-direct expenses
Department 1 contribution as % of sales=($1,000,000-$700,000-$100,000)/$1,000,000=20%
Department 2 contribution as % of sales=($400,000-$150,000-$40,000)/$400,000=52.5%
Department 3 contribution as % of sales=($700,000-$300,000-$150,000)/$700,000=35.7%