Assume that the average cost of airfare is $400 per chaperone and incidentals are $150 per day per chaperone. All vacation packages are for 6 days. If a ratio of one chaperone per 15 travelers is kept, what is the minimum amount that must be included in the vacation package price charged to each customer to cover the cost of a chaperone? (A) $60 (B) $87 (C) $104 (D) $150