Answer and Explanation:
a. The computation of the total manufacturing overhead cost is
= Conversion cost - direct labor cost
= ($15,000 ÷ 0.30) - $15,000
= $50,000 - $15,000
= $35,000
b. The compuattion of the direct material cost is
= Conversion cost - direct labor cost
= ($15,000 ÷ 0.40) - $15,000
= $37,500 - $15,000
= $22,500
c. The total manufacturing cost is
= direct material cost + direct labor cost + manufacturing overhead cost
= $22,500 + $15,000 + $35,000
= $72,500
d. The total variable selling and administrative cost is
= Sales × commission percentage
= $120,000 × 5%
= $6,000
e. The total variable cost is
= direct material cost + direct labor cost + variable selling and administrative cost
= $22,500 + $15,000 + $6,000
= $43,500
f. The fixed cost is
= Manufacturing overhead + fixed selling and admin expenses
= $35,000 + ($18,000 - $6,000)
= $47,000
g. The total contribution margin is
= Sales - variable expenses
= $120,000 - $43,500
= $76,500
We simply applied the above formulas