1. If Qs = -20 + 10p, and Qd = 400 - 20p, what is the equilibrium price and quantity? (2 marks)
"Qd=Qs"
"400-20p=-20+10p"
"400+20=10p+20p"
"420=30p"
"P=14"
"Q=400-20(14)\\\\=400-280\\\\=120"
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