Need math help with average/understanding the wording of an exercise

Need math help with average/understanding the wording of an exercise

Hi im new to Studypool,  and i like the idea of this useful forum.

I am an international student trying to prepare for the GMAT, im having a difficulty with understanding the the meaning of the below listed question, could anyone please advise if this question is a clear solvable exercise 

“Company X sells a line of 25 products with an average of retail price of 1,200$, if none of thee items sells for less than $420 and exactly 10 of the products sell for less than $1,000, what is the greatest possible selling price of the most expensive product? 

$2,600 
$3,900
$7,800
$11,800
$18,200

Thank you, i hope my question is acceptable over your forum.

Regards
Jery