A: How much ... this mug? B: ... ... 3 pounds.
A: How much is this mug? B: It´s 3 pounds.
A: How much ... those T-shirts? B: ... ... 25 pounds.
A: How much are those T-shirts? B: They´re 25 pounds.
A: How much ... these plates? B: ... ... 15 pounds.
A: How much are these plates? B: They´re 15 pounds.