Total price of books = 18*20*0.9=324.
Postage = 10
Remittance fee =(324/ 100)* 1≈4
Total cost =324+ 10+4=338.
(2)
Set up x books by mail order.
Send 500 books by post, and the total book purchase price = 500 * 20 * 0.7 = 7000 > 6672.8.
So 100
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