Answer:
Our answer is B $187,500 increase
Step-by-step explanation:
$300,000/75,000 units = $4 FOH per unit at 75,000 unit level
$300,000/200,000 units = $1.50 FOH per unit at 200,000 unit level
$4 - $1.50 = $2.50 less FOH cost in each unit sold
$2.50 x 75,000 = $187,500 gross margin increase