Answer:
Free of charge:
Demand: 6,000 copies per week
Supply: 400 copies per week (provided by the university)
Price: 10¢ per copy:
Demand: 5,000 copies per week
Supply: Not mentioned in the given information
Price: 20¢ per copy:
Demand: Not mentioned in the given information
Supply: 1,200 copies per week (provided by the university)
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For 0¢ (free of charge), the demand exceeds the supply. The university is prepared to supply only 400 copies per week, but the demand is 6,000 copies per week. Therefore, there will be a shortage of 5,600 copies.
For 20¢ per copy, the supply exceeds the demand. The university is willing to supply 1,200 copies per week, but the demand is not mentioned. Based on the given information, we cannot determine the exact surplus quantity.