Case Study A company purchased four kinds of steel plate: 420 M/T, and the type is 6 inch, 8 inch, 10 inch and 12 inch. The quantity is 100 M/T each size, and the contract marked that: "5% more or less for each size, at the seller's option. When the seller delivered the goods, the quantity is: 6 inch-70M/T, 8 inch-80M/T, 10 inch-60M/T, 12 inch-210M/T. And the total quantity is 420 M/T. When the exporter submitted the full set of document, the importer refused to receive the goods owing to quantity problem. QUESTION: Do you think the importer's action is reasonable? List your reasons