19 The table sets out the demand and supply schedules for an illegal drug.

a If there are no penalties on buying or selling the drug, what is the price and how many units a day are consumed?
b If the penalty on sellers is €20 per unit, what are the price and the quantity consumed?
c If the penalty on buyers is €20 per unit, what are the price and the quantity consumed?

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Price (euros Quantity Quantity demanded supplied per unit) (units per day) 50 500 300 60 400 400 70 300 500 80 200 600 90 100 700