An airplane company is determining the difference in selling price if rows of first-class seats are added to a new design. Using the average selling price of 1 dollars comma 000 per first-class seat, the total selling price for one new row is f of r is equal to 4 comma 000 r Each row in first class eliminates two rows of economy seats. Using the average selling price of 150 dollars per economy seat, the total price for each pair of removed rows is e times r is equal to 1 comma 800 r Which is d times r , the profit or loss for adding r rows of first class seats?
Answer
A
d times r is equal to negative 2 comma 200 r
B
d times r is equal to negative 5 comma 800 r
C
d times r is equal to 2 comma 200 r
D
d times r is equal to 5 comma 800 r
Explanation
Adding r rows of first-class seats brings in 4,000r dollars. The two economy rows removed for each first-class row would have brought in 1,800r dollars, so the change in selling price is 4,000r − 1,800r = 2,200r. This is a profit of 2,200r, choice C.
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