A merchant paid $300 for a shipment of x identical calculators. The merchant used two of the calculators as demonstrators and sold each of the others for $5 more than the average(arithmetic mean) cost of the x calculators. If the total revenue from the sale of the calculators was $120 more than the cost of the shipment, how many calculators were in the shipment?
24
25
26
28
30
没有给出每个计算器的成本啊??题目只说了运费是300
+1
shipment不是运费的意思,是指这批货
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