Answer:
$460,000 increment in the operating income
Step-by-step explanation:
Production = 75000
Unit sales price = $420
Sales revenue 31,500,000
Cost of sales
Manufacturing (260*75000) 19,500,000
Gross profit 12,000,000
Marketing and admin (40*75000) 3,000,000
Manufacturing 770000
Marketing * Admin 200000
Operating income 8030000
Revenue for special order = 375*4000 = 1,500,000
Manufacturing cost =4000*260 1,040,000
Gross profit 460,000
There will be an increment of $460,000 in the operating income.