this is the homework question, can someone help me to solve it please , thx!

b1) (3 marks) What are the prices of the sellers' items a,b,c when the market clears? b2) (3 marks) Which buyer gets item a and at what price? b3) (5 marks) Justify your answers to b1) and b2). b4) (2 marks) Which kind of auction does the construction of market-clearing prices procedure implement in this case